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Finding the Fourth Proportional to 656.43, 985.47 and 521.16

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Solution

The fourth proportional to 656.43, 985.47 and 521.16 is: 782.39

Step by Step Solution

  1. Step 1: Write the proportion equation
    656.43 : 985.47 = 521.16 : x
  2. Step 2: Convert to fraction form
    656.43/985.47 = 521.16/x
  3. Step 3: Cross multiply
    656.43x = 985.47 × 521.16
  4. Step 4: Simplify right side
    656.43x = 513,587.55
  5. Step 5: Solve for x
    x = 513,587.55/656.43
  6. Step 6: Final answer
    x = 782.39

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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.