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Finding the Fourth Proportional to 731.71, 1,007.80 and 620.51

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Solution

The fourth proportional to 731.71, 1,007.80 and 620.51 is: 854.64

Step by Step Solution

  1. Step 1: Write the proportion equation
    731.71 : 1,007.80 = 620.51 : x
  2. Step 2: Convert to fraction form
    731.71/1,007.80 = 620.51/x
  3. Step 3: Cross multiply
    731.71x = 1,007.80 × 620.51
  4. Step 4: Simplify right side
    731.71x = 625,349.98
  5. Step 5: Solve for x
    x = 625,349.98/731.71
  6. Step 6: Final answer
    x = 854.64

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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.