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Finding the Fourth Proportional to 530.42, 731.78 and 309.30

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Solution

The fourth proportional to 530.42, 731.78 and 309.30 is: 426.72

Step by Step Solution

  1. Step 1: Write the proportion equation
    530.42 : 731.78 = 309.30 : x
  2. Step 2: Convert to fraction form
    530.42/731.78 = 309.30/x
  3. Step 3: Cross multiply
    530.42x = 731.78 × 309.30
  4. Step 4: Simplify right side
    530.42x = 226,339.55
  5. Step 5: Solve for x
    x = 226,339.55/530.42
  6. Step 6: Final answer
    x = 426.72

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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.