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Finding the Fourth Proportional to 680.54, 1,016.40 and 557.42

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Solution

The fourth proportional to 680.54, 1,016.40 and 557.42 is: 832.52

Step by Step Solution

  1. Step 1: Write the proportion equation
    680.54 : 1,016.40 = 557.42 : x
  2. Step 2: Convert to fraction form
    680.54/1,016.40 = 557.42/x
  3. Step 3: Cross multiply
    680.54x = 1,016.40 × 557.42
  4. Step 4: Simplify right side
    680.54x = 566,561.69
  5. Step 5: Solve for x
    x = 566,561.69/680.54
  6. Step 6: Final answer
    x = 832.52

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Why These Related Problems?

These problems maintain the same ratio (1.49) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.