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Finding the Fourth Proportional to 621.20, 922.78 and 610.40

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Solution

The fourth proportional to 621.20, 922.78 and 610.40 is: 906.74

Step by Step Solution

  1. Step 1: Write the proportion equation
    621.20 : 922.78 = 610.40 : x
  2. Step 2: Convert to fraction form
    621.20/922.78 = 610.40/x
  3. Step 3: Cross multiply
    621.20x = 922.78 × 610.40
  4. Step 4: Simplify right side
    621.20x = 563,264.91
  5. Step 5: Solve for x
    x = 563,264.91/621.20
  6. Step 6: Final answer
    x = 906.74

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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.