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Finding the Fourth Proportional to 113.38, 156.47 and 66.74

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Solution

The fourth proportional to 113.38, 156.47 and 66.74 is: 92.10

Step by Step Solution

  1. Step 1: Write the proportion equation
    113.38 : 156.47 = 66.74 : x
  2. Step 2: Convert to fraction form
    113.38/156.47 = 66.74/x
  3. Step 3: Cross multiply
    113.38x = 156.47 × 66.74
  4. Step 4: Simplify right side
    113.38x = 10,442.81
  5. Step 5: Solve for x
    x = 10,442.81/113.38
  6. Step 6: Final answer
    x = 92.10

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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.