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Finding the Fourth Proportional to 113.83, 157.27 and 87.70

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Solution

The fourth proportional to 113.83, 157.27 and 87.70 is: 121.17

Step by Step Solution

  1. Step 1: Write the proportion equation
    113.83 : 157.27 = 87.70 : x
  2. Step 2: Convert to fraction form
    113.83/157.27 = 87.70/x
  3. Step 3: Cross multiply
    113.83x = 157.27 × 87.70
  4. Step 4: Simplify right side
    113.83x = 13,792.58
  5. Step 5: Solve for x
    x = 13,792.58/113.83
  6. Step 6: Final answer
    x = 121.17

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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.