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Finding the Fourth Proportional to 1,587.77, 2,190.90 and 879.44

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Solution

The fourth proportional to 1,587.77, 2,190.90 and 879.44 is: 1,213.50

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,587.77 : 2,190.90 = 879.44 : x
  2. Step 2: Convert to fraction form
    1,587.77/2,190.90 = 879.44/x
  3. Step 3: Cross multiply
    1,587.77x = 2,190.90 × 879.44
  4. Step 4: Simplify right side
    1,587.77x = 1,926,765.76
  5. Step 5: Solve for x
    x = 1,926,765.76/1,587.77
  6. Step 6: Final answer
    x = 1,213.50

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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.