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Finding the Fourth Proportional to 610.71, 916.55 and 318.30

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Solution

The fourth proportional to 610.71, 916.55 and 318.30 is: 477.70

Step by Step Solution

  1. Step 1: Write the proportion equation
    610.71 : 916.55 = 318.30 : x
  2. Step 2: Convert to fraction form
    610.71/916.55 = 318.30/x
  3. Step 3: Cross multiply
    610.71x = 916.55 × 318.30
  4. Step 4: Simplify right side
    610.71x = 291,736.37
  5. Step 5: Solve for x
    x = 291,736.37/610.71
  6. Step 6: Final answer
    x = 477.70

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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.