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Finding the Fourth Proportional to 657.52, 987.65 and 521.52

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Solution

The fourth proportional to 657.52, 987.65 and 521.52 is: 783.36

Step by Step Solution

  1. Step 1: Write the proportion equation
    657.52 : 987.65 = 521.52 : x
  2. Step 2: Convert to fraction form
    657.52/987.65 = 521.52/x
  3. Step 3: Cross multiply
    657.52x = 987.65 × 521.52
  4. Step 4: Simplify right side
    657.52x = 515,080.36
  5. Step 5: Solve for x
    x = 515,080.36/657.52
  6. Step 6: Final answer
    x = 783.36

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.