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Finding the Fourth Proportional to 75.66, 113.39 and 55.40

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Solution

The fourth proportional to 75.66, 113.39 and 55.40 is: 83.02

Step by Step Solution

  1. Step 1: Write the proportion equation
    75.66 : 113.39 = 55.40 : x
  2. Step 2: Convert to fraction form
    75.66/113.39 = 55.40/x
  3. Step 3: Cross multiply
    75.66x = 113.39 × 55.40
  4. Step 4: Simplify right side
    75.66x = 6,280.96
  5. Step 5: Solve for x
    x = 6,280.96/75.66
  6. Step 6: Final answer
    x = 83.02

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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.