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Finding the Fourth Proportional to 66.98, 92.80 and 65.31

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Solution

The fourth proportional to 66.98, 92.80 and 65.31 is: 90.48

Step by Step Solution

  1. Step 1: Write the proportion equation
    66.98 : 92.80 = 65.31 : x
  2. Step 2: Convert to fraction form
    66.98/92.80 = 65.31/x
  3. Step 3: Cross multiply
    66.98x = 92.80 × 65.31
  4. Step 4: Simplify right side
    66.98x = 6,060.13
  5. Step 5: Solve for x
    x = 6,060.13/66.98
  6. Step 6: Final answer
    x = 90.48

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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.