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Finding the Fourth Proportional to 109.29, 150.75 and 72.45

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Solution

The fourth proportional to 109.29, 150.75 and 72.45 is: 99.93

Step by Step Solution

  1. Step 1: Write the proportion equation
    109.29 : 150.75 = 72.45 : x
  2. Step 2: Convert to fraction form
    109.29/150.75 = 72.45/x
  3. Step 3: Cross multiply
    109.29x = 150.75 × 72.45
  4. Step 4: Simplify right side
    109.29x = 10,921.84
  5. Step 5: Solve for x
    x = 10,921.84/109.29
  6. Step 6: Final answer
    x = 99.93

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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.