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Finding the Fourth Proportional to 65.61, 97.71 and 64.91

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Solution

The fourth proportional to 65.61, 97.71 and 64.91 is: 96.66

Step by Step Solution

  1. Step 1: Write the proportion equation
    65.61 : 97.71 = 64.91 : x
  2. Step 2: Convert to fraction form
    65.61/97.71 = 64.91/x
  3. Step 3: Cross multiply
    65.61x = 97.71 × 64.91
  4. Step 4: Simplify right side
    65.61x = 6,341.87
  5. Step 5: Solve for x
    x = 6,341.87/65.61
  6. Step 6: Final answer
    x = 96.66

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Why These Related Problems?

These problems maintain the same ratio (1.49) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.