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Finding the Fourth Proportional to 75.68, 113.46 and 64.90

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Solution

The fourth proportional to 75.68, 113.46 and 64.90 is: 97.30

Step by Step Solution

  1. Step 1: Write the proportion equation
    75.68 : 113.46 = 64.90 : x
  2. Step 2: Convert to fraction form
    75.68/113.46 = 64.90/x
  3. Step 3: Cross multiply
    75.68x = 113.46 × 64.90
  4. Step 4: Simplify right side
    75.68x = 7,363.55
  5. Step 5: Solve for x
    x = 7,363.55/75.68
  6. Step 6: Final answer
    x = 97.30

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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.