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Finding the Fourth Proportional to 107.01, 147.42 and 87.57

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Solution

The fourth proportional to 107.01, 147.42 and 87.57 is: 120.64

Step by Step Solution

  1. Step 1: Write the proportion equation
    107.01 : 147.42 = 87.57 : x
  2. Step 2: Convert to fraction form
    107.01/147.42 = 87.57/x
  3. Step 3: Cross multiply
    107.01x = 147.42 × 87.57
  4. Step 4: Simplify right side
    107.01x = 12,909.57
  5. Step 5: Solve for x
    x = 12,909.57/107.01
  6. Step 6: Final answer
    x = 120.64

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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.