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Finding the Fourth Proportional to 621.48, 932.64 and 619.20

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Solution

The fourth proportional to 621.48, 932.64 and 619.20 is: 929.22

Step by Step Solution

  1. Step 1: Write the proportion equation
    621.48 : 932.64 = 619.20 : x
  2. Step 2: Convert to fraction form
    621.48/932.64 = 619.20/x
  3. Step 3: Cross multiply
    621.48x = 932.64 × 619.20
  4. Step 4: Simplify right side
    621.48x = 577,490.69
  5. Step 5: Solve for x
    x = 577,490.69/621.48
  6. Step 6: Final answer
    x = 929.22

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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.