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Finding the Fourth Proportional to 91.02, 125.55 and 69.21

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Solution

The fourth proportional to 91.02, 125.55 and 69.21 is: 95.47

Step by Step Solution

  1. Step 1: Write the proportion equation
    91.02 : 125.55 = 69.21 : x
  2. Step 2: Convert to fraction form
    91.02/125.55 = 69.21/x
  3. Step 3: Cross multiply
    91.02x = 125.55 × 69.21
  4. Step 4: Simplify right side
    91.02x = 8,689.32
  5. Step 5: Solve for x
    x = 8,689.32/91.02
  6. Step 6: Final answer
    x = 95.47

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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.