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Finding the Fourth Proportional to 158.31, 219.95 and 156.39

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Solution

The fourth proportional to 158.31, 219.95 and 156.39 is: 217.28

Step by Step Solution

  1. Step 1: Write the proportion equation
    158.31 : 219.95 = 156.39 : x
  2. Step 2: Convert to fraction form
    158.31/219.95 = 156.39/x
  3. Step 3: Cross multiply
    158.31x = 219.95 × 156.39
  4. Step 4: Simplify right side
    158.31x = 34,397.20
  5. Step 5: Solve for x
    x = 34,397.20/158.31
  6. Step 6: Final answer
    x = 217.28

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Why These Related Problems?

These problems maintain the same ratio (1.39) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.