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Finding the Fourth Proportional to 610.52, 913.80 and 391.28

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Solution

The fourth proportional to 610.52, 913.80 and 391.28 is: 585.65

Step by Step Solution

  1. Step 1: Write the proportion equation
    610.52 : 913.80 = 391.28 : x
  2. Step 2: Convert to fraction form
    610.52/913.80 = 391.28/x
  3. Step 3: Cross multiply
    610.52x = 913.80 × 391.28
  4. Step 4: Simplify right side
    610.52x = 357,551.66
  5. Step 5: Solve for x
    x = 357,551.66/610.52
  6. Step 6: Final answer
    x = 585.65

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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.