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Finding the Fourth Proportional to 88.39, 131.88 and 75.40

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Solution

The fourth proportional to 88.39, 131.88 and 75.40 is: 112.50

Step by Step Solution

  1. Step 1: Write the proportion equation
    88.39 : 131.88 = 75.40 : x
  2. Step 2: Convert to fraction form
    88.39/131.88 = 75.40/x
  3. Step 3: Cross multiply
    88.39x = 131.88 × 75.40
  4. Step 4: Simplify right side
    88.39x = 9,944.02
  5. Step 5: Solve for x
    x = 9,944.02/88.39
  6. Step 6: Final answer
    x = 112.50

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Why These Related Problems?

These problems maintain the same ratio (1.49) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.