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Finding the Fourth Proportional to 64.91, 97.28 and 56.76

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Solution

The fourth proportional to 64.91, 97.28 and 56.76 is: 85.07

Step by Step Solution

  1. Step 1: Write the proportion equation
    64.91 : 97.28 = 56.76 : x
  2. Step 2: Convert to fraction form
    64.91/97.28 = 56.76/x
  3. Step 3: Cross multiply
    64.91x = 97.28 × 56.76
  4. Step 4: Simplify right side
    64.91x = 5,521.57
  5. Step 5: Solve for x
    x = 5,521.57/64.91
  6. Step 6: Final answer
    x = 85.07

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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.