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Finding the Fourth Proportional to 114.39, 157.92 and 100.74

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Solution

The fourth proportional to 114.39, 157.92 and 100.74 is: 139.08

Step by Step Solution

  1. Step 1: Write the proportion equation
    114.39 : 157.92 = 100.74 : x
  2. Step 2: Convert to fraction form
    114.39/157.92 = 100.74/x
  3. Step 3: Cross multiply
    114.39x = 157.92 × 100.74
  4. Step 4: Simplify right side
    114.39x = 15,908.86
  5. Step 5: Solve for x
    x = 15,908.86/114.39
  6. Step 6: Final answer
    x = 139.08

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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.