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Finding the Fourth Proportional to 66.90, 92.68 and 64.06

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Solution

The fourth proportional to 66.90, 92.68 and 64.06 is: 88.75

Step by Step Solution

  1. Step 1: Write the proportion equation
    66.90 : 92.68 = 64.06 : x
  2. Step 2: Convert to fraction form
    66.90/92.68 = 64.06/x
  3. Step 3: Cross multiply
    66.90x = 92.68 × 64.06
  4. Step 4: Simplify right side
    66.90x = 5,937.08
  5. Step 5: Solve for x
    x = 5,937.08/66.90
  6. Step 6: Final answer
    x = 88.75

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Why These Related Problems?

These problems maintain the same ratio (1.39) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.