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Finding the Fourth Proportional to 66.65, 90.82 and 65.17

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Solution

The fourth proportional to 66.65, 90.82 and 65.17 is: 88.80

Step by Step Solution

  1. Step 1: Write the proportion equation
    66.65 : 90.82 = 65.17 : x
  2. Step 2: Convert to fraction form
    66.65/90.82 = 65.17/x
  3. Step 3: Cross multiply
    66.65x = 90.82 × 65.17
  4. Step 4: Simplify right side
    66.65x = 5,918.74
  5. Step 5: Solve for x
    x = 5,918.74/66.65
  6. Step 6: Final answer
    x = 88.80

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Why These Related Problems?

These problems maintain the same ratio (1.36) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.