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Finding the Fourth Proportional to 66.65, 92.22 and 58.05

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Solution

The fourth proportional to 66.65, 92.22 and 58.05 is: 80.31

Step by Step Solution

  1. Step 1: Write the proportion equation
    66.65 : 92.22 = 58.05 : x
  2. Step 2: Convert to fraction form
    66.65/92.22 = 58.05/x
  3. Step 3: Cross multiply
    66.65x = 92.22 × 58.05
  4. Step 4: Simplify right side
    66.65x = 5,352.91
  5. Step 5: Solve for x
    x = 5,352.91/66.65
  6. Step 6: Final answer
    x = 80.31

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.