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Finding the Fourth Proportional to 64.68, 97.05 and 57.90

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Solution

The fourth proportional to 64.68, 97.05 and 57.90 is: 86.88

Step by Step Solution

  1. Step 1: Write the proportion equation
    64.68 : 97.05 = 57.90 : x
  2. Step 2: Convert to fraction form
    64.68/97.05 = 57.90/x
  3. Step 3: Cross multiply
    64.68x = 97.05 × 57.90
  4. Step 4: Simplify right side
    64.68x = 5,619.20
  5. Step 5: Solve for x
    x = 5,619.20/64.68
  6. Step 6: Final answer
    x = 86.88

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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.