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Finding the Fourth Proportional to 83.31, 124.40 and 66.00

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Solution

The fourth proportional to 83.31, 124.40 and 66.00 is: 98.55

Step by Step Solution

  1. Step 1: Write the proportion equation
    83.31 : 124.40 = 66.00 : x
  2. Step 2: Convert to fraction form
    83.31/124.40 = 66.00/x
  3. Step 3: Cross multiply
    83.31x = 124.40 × 66.00
  4. Step 4: Simplify right side
    83.31x = 8,210.10
  5. Step 5: Solve for x
    x = 8,210.10/83.31
  6. Step 6: Final answer
    x = 98.55

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Why These Related Problems?

These problems maintain the same ratio (1.49) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.