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Finding the Fourth Proportional to 430.97, 646.52 and 138.47

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Solution

The fourth proportional to 430.97, 646.52 and 138.47 is: 207.72

Step by Step Solution

  1. Step 1: Write the proportion equation
    430.97 : 646.52 = 138.47 : x
  2. Step 2: Convert to fraction form
    430.97/646.52 = 138.47/x
  3. Step 3: Cross multiply
    430.97x = 646.52 × 138.47
  4. Step 4: Simplify right side
    430.97x = 89,519.70
  5. Step 5: Solve for x
    x = 89,519.70/430.97
  6. Step 6: Final answer
    x = 207.72

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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.