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Finding the Fourth Proportional to 160.32, 239.28 and 138.72

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Solution

The fourth proportional to 160.32, 239.28 and 138.72 is: 207.04

Step by Step Solution

  1. Step 1: Write the proportion equation
    160.32 : 239.28 = 138.72 : x
  2. Step 2: Convert to fraction form
    160.32/239.28 = 138.72/x
  3. Step 3: Cross multiply
    160.32x = 239.28 × 138.72
  4. Step 4: Simplify right side
    160.32x = 33,192.92
  5. Step 5: Solve for x
    x = 33,192.92/160.32
  6. Step 6: Final answer
    x = 207.04

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Why These Related Problems?

These problems maintain the same ratio (1.49) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.