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Finding the Fourth Proportional to 75.13, 113.20 and 66.22

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Solution

The fourth proportional to 75.13, 113.20 and 66.22 is: 99.77

Step by Step Solution

  1. Step 1: Write the proportion equation
    75.13 : 113.20 = 66.22 : x
  2. Step 2: Convert to fraction form
    75.13/113.20 = 66.22/x
  3. Step 3: Cross multiply
    75.13x = 113.20 × 66.22
  4. Step 4: Simplify right side
    75.13x = 7,495.66
  5. Step 5: Solve for x
    x = 7,495.66/75.13
  6. Step 6: Final answer
    x = 99.77

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Why These Related Problems?

These problems maintain the same ratio (1.51) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.