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Finding the Fourth Proportional to 91.02, 125.40 and 66.30

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Solution

The fourth proportional to 91.02, 125.40 and 66.30 is: 91.34

Step by Step Solution

  1. Step 1: Write the proportion equation
    91.02 : 125.40 = 66.30 : x
  2. Step 2: Convert to fraction form
    91.02/125.40 = 66.30/x
  3. Step 3: Cross multiply
    91.02x = 125.40 × 66.30
  4. Step 4: Simplify right side
    91.02x = 8,314.02
  5. Step 5: Solve for x
    x = 8,314.02/91.02
  6. Step 6: Final answer
    x = 91.34

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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.