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Finding the Fourth Proportional to 113.90, 156.86 and 87.98

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Solution

The fourth proportional to 113.90, 156.86 and 87.98 is: 121.16

Step by Step Solution

  1. Step 1: Write the proportion equation
    113.90 : 156.86 = 87.98 : x
  2. Step 2: Convert to fraction form
    113.90/156.86 = 87.98/x
  3. Step 3: Cross multiply
    113.90x = 156.86 × 87.98
  4. Step 4: Simplify right side
    113.90x = 13,800.54
  5. Step 5: Solve for x
    x = 13,800.54/113.90
  6. Step 6: Final answer
    x = 121.16

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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.