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Finding the Fourth Proportional to 925.10, 1,387.65 and 439.10

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Solution

The fourth proportional to 925.10, 1,387.65 and 439.10 is: 658.65

Step by Step Solution

  1. Step 1: Write the proportion equation
    925.10 : 1,387.65 = 439.10 : x
  2. Step 2: Convert to fraction form
    925.10/1,387.65 = 439.10/x
  3. Step 3: Cross multiply
    925.10x = 1,387.65 × 439.10
  4. Step 4: Simplify right side
    925.10x = 609,317.12
  5. Step 5: Solve for x
    x = 609,317.12/925.10
  6. Step 6: Final answer
    x = 658.65

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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.