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Finding the Fourth Proportional to 65.62, 89.97 and 64.80

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Solution

The fourth proportional to 65.62, 89.97 and 64.80 is: 88.85

Step by Step Solution

  1. Step 1: Write the proportion equation
    65.62 : 89.97 = 64.80 : x
  2. Step 2: Convert to fraction form
    65.62/89.97 = 64.80/x
  3. Step 3: Cross multiply
    65.62x = 89.97 × 64.80
  4. Step 4: Simplify right side
    65.62x = 5,830.06
  5. Step 5: Solve for x
    x = 5,830.06/65.62
  6. Step 6: Final answer
    x = 88.85

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Why These Related Problems?

These problems maintain the same ratio (1.37) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.