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Finding the Fourth Proportional to 1,587.86, 2,190.74 and 1,028.76

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Solution

The fourth proportional to 1,587.86, 2,190.74 and 1,028.76 is: 1,419.35

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,587.86 : 2,190.74 = 1,028.76 : x
  2. Step 2: Convert to fraction form
    1,587.86/2,190.74 = 1,028.76/x
  3. Step 3: Cross multiply
    1,587.86x = 2,190.74 × 1,028.76
  4. Step 4: Simplify right side
    1,587.86x = 2,253,740.54
  5. Step 5: Solve for x
    x = 2,253,740.54/1,587.86
  6. Step 6: Final answer
    x = 1,419.35

Related Problems

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Half scale
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Double scale
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Similar ratio
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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.