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Finding the Fourth Proportional to 621.45, 932.18 and 553.82

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Solution

The fourth proportional to 621.45, 932.18 and 553.82 is: 830.72

Step by Step Solution

  1. Step 1: Write the proportion equation
    621.45 : 932.18 = 553.82 : x
  2. Step 2: Convert to fraction form
    621.45/932.18 = 553.82/x
  3. Step 3: Cross multiply
    621.45x = 932.18 × 553.82
  4. Step 4: Simplify right side
    621.45x = 516,252.50
  5. Step 5: Solve for x
    x = 516,252.50/621.45
  6. Step 6: Final answer
    x = 830.72

Related Problems

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Half scale
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Double scale
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Similar ratio
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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.