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Finding the Fourth Proportional to 75.60, 113.40 and 26.87

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Solution

The fourth proportional to 75.60, 113.40 and 26.87 is: 40.30

Step by Step Solution

  1. Step 1: Write the proportion equation
    75.60 : 113.40 = 26.87 : x
  2. Step 2: Convert to fraction form
    75.60/113.40 = 26.87/x
  3. Step 3: Cross multiply
    75.60x = 113.40 × 26.87
  4. Step 4: Simplify right side
    75.60x = 3,046.49
  5. Step 5: Solve for x
    x = 3,046.49/75.60
  6. Step 6: Final answer
    x = 40.30

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.