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Finding the Fourth Proportional to 157.13, 216.70 and 138.73

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Solution

The fourth proportional to 157.13, 216.70 and 138.73 is: 191.32

Step by Step Solution

  1. Step 1: Write the proportion equation
    157.13 : 216.70 = 138.73 : x
  2. Step 2: Convert to fraction form
    157.13/216.70 = 138.73/x
  3. Step 3: Cross multiply
    157.13x = 216.70 × 138.73
  4. Step 4: Simplify right side
    157.13x = 30,062.79
  5. Step 5: Solve for x
    x = 30,062.79/157.13
  6. Step 6: Final answer
    x = 191.32

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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.