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Finding the Fourth Proportional to 530.38, 731.78 and 309.30

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Solution

The fourth proportional to 530.38, 731.78 and 309.30 is: 426.75

Step by Step Solution

  1. Step 1: Write the proportion equation
    530.38 : 731.78 = 309.30 : x
  2. Step 2: Convert to fraction form
    530.38/731.78 = 309.30/x
  3. Step 3: Cross multiply
    530.38x = 731.78 × 309.30
  4. Step 4: Simplify right side
    530.38x = 226,338.01
  5. Step 5: Solve for x
    x = 226,338.01/530.38
  6. Step 6: Final answer
    x = 426.75

Related Problems

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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 (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.