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Finding the Fourth Proportional to 711.58, 1,061.08 and 686.20

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Solution

The fourth proportional to 711.58, 1,061.08 and 686.20 is: 1,023.24

Step by Step Solution

  1. Step 1: Write the proportion equation
    711.58 : 1,061.08 = 686.20 : x
  2. Step 2: Convert to fraction form
    711.58/1,061.08 = 686.20/x
  3. Step 3: Cross multiply
    711.58x = 1,061.08 × 686.20
  4. Step 4: Simplify right side
    711.58x = 728,110.36
  5. Step 5: Solve for x
    x = 728,110.36/711.58
  6. Step 6: Final answer
    x = 1,023.24

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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.