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Finding the Fourth Proportional to 109.85, 150.76 and 99.47

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Solution

The fourth proportional to 109.85, 150.76 and 99.47 is: 136.51

Step by Step Solution

  1. Step 1: Write the proportion equation
    109.85 : 150.76 = 99.47 : x
  2. Step 2: Convert to fraction form
    109.85/150.76 = 99.47/x
  3. Step 3: Cross multiply
    109.85x = 150.76 × 99.47
  4. Step 4: Simplify right side
    109.85x = 14,995.40
  5. Step 5: Solve for x
    x = 14,995.40/109.85
  6. Step 6: Final answer
    x = 136.51

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Why These Related Problems?

These problems maintain the same ratio (1.37) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.