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Finding the Fourth Proportional to 113.45, 156.55 and 66.81

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Solution

The fourth proportional to 113.45, 156.55 and 66.81 is: 92.19

Step by Step Solution

  1. Step 1: Write the proportion equation
    113.45 : 156.55 = 66.81 : x
  2. Step 2: Convert to fraction form
    113.45/156.55 = 66.81/x
  3. Step 3: Cross multiply
    113.45x = 156.55 × 66.81
  4. Step 4: Simplify right side
    113.45x = 10,459.11
  5. Step 5: Solve for x
    x = 10,459.11/113.45
  6. Step 6: Final answer
    x = 92.19

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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.