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Finding the Fourth Proportional to 109.74, 151.47 and 77.16

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Solution

The fourth proportional to 109.74, 151.47 and 77.16 is: 106.50

Step by Step Solution

  1. Step 1: Write the proportion equation
    109.74 : 151.47 = 77.16 : x
  2. Step 2: Convert to fraction form
    109.74/151.47 = 77.16/x
  3. Step 3: Cross multiply
    109.74x = 151.47 × 77.16
  4. Step 4: Simplify right side
    109.74x = 11,687.43
  5. Step 5: Solve for x
    x = 11,687.43/109.74
  6. Step 6: Final answer
    x = 106.50

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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.