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Finding the Fourth Proportional to 613.39, 920.42 and 430.42

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Solution

The fourth proportional to 613.39, 920.42 and 430.42 is: 645.86

Step by Step Solution

  1. Step 1: Write the proportion equation
    613.39 : 920.42 = 430.42 : x
  2. Step 2: Convert to fraction form
    613.39/920.42 = 430.42/x
  3. Step 3: Cross multiply
    613.39x = 920.42 × 430.42
  4. Step 4: Simplify right side
    613.39x = 396,160.42
  5. Step 5: Solve for x
    x = 396,160.42/613.39
  6. Step 6: Final answer
    x = 645.86

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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.