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Finding the Fourth Proportional to 718.74, 991.52 and 453.28

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Solution

The fourth proportional to 718.74, 991.52 and 453.28 is: 625.31

Step by Step Solution

  1. Step 1: Write the proportion equation
    718.74 : 991.52 = 453.28 : x
  2. Step 2: Convert to fraction form
    718.74/991.52 = 453.28/x
  3. Step 3: Cross multiply
    718.74x = 991.52 × 453.28
  4. Step 4: Simplify right side
    718.74x = 449,436.19
  5. Step 5: Solve for x
    x = 449,436.19/718.74
  6. Step 6: Final answer
    x = 625.31

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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.