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Finding the Fourth Proportional to 621.80, 932.70 and 554.60

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Solution

The fourth proportional to 621.80, 932.70 and 554.60 is: 831.90

Step by Step Solution

  1. Step 1: Write the proportion equation
    621.80 : 932.70 = 554.60 : x
  2. Step 2: Convert to fraction form
    621.80/932.70 = 554.60/x
  3. Step 3: Cross multiply
    621.80x = 932.70 × 554.60
  4. Step 4: Simplify right side
    621.80x = 517,275.42
  5. Step 5: Solve for x
    x = 517,275.42/621.80
  6. Step 6: Final answer
    x = 831.90

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Double scale
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1.5x scale

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.