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Finding the Fourth Proportional to 113.64, 156.72 and 87.72

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Solution

The fourth proportional to 113.64, 156.72 and 87.72 is: 120.97

Step by Step Solution

  1. Step 1: Write the proportion equation
    113.64 : 156.72 = 87.72 : x
  2. Step 2: Convert to fraction form
    113.64/156.72 = 87.72/x
  3. Step 3: Cross multiply
    113.64x = 156.72 × 87.72
  4. Step 4: Simplify right side
    113.64x = 13,747.48
  5. Step 5: Solve for x
    x = 13,747.48/113.64
  6. Step 6: Final answer
    x = 120.97

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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.