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Finding the Fourth Proportional to 1,587.38, 2,190.51 and 879.22

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Solution

The fourth proportional to 1,587.38, 2,190.51 and 879.22 is: 1,213.28

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,587.38 : 2,190.51 = 879.22 : x
  2. Step 2: Convert to fraction form
    1,587.38/2,190.51 = 879.22/x
  3. Step 3: Cross multiply
    1,587.38x = 2,190.51 × 879.22
  4. Step 4: Simplify right side
    1,587.38x = 1,925,930.62
  5. Step 5: Solve for x
    x = 1,925,930.62/1,587.38
  6. Step 6: Final answer
    x = 1,213.28

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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.