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Finding the Fourth Proportional to 112.35, 155.01 and 70.87

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Solution

The fourth proportional to 112.35, 155.01 and 70.87 is: 97.78

Step by Step Solution

  1. Step 1: Write the proportion equation
    112.35 : 155.01 = 70.87 : x
  2. Step 2: Convert to fraction form
    112.35/155.01 = 70.87/x
  3. Step 3: Cross multiply
    112.35x = 155.01 × 70.87
  4. Step 4: Simplify right side
    112.35x = 10,985.17
  5. Step 5: Solve for x
    x = 10,985.17/112.35
  6. Step 6: Final answer
    x = 97.78

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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.