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Finding the Fourth Proportional to 91, 125.70 and 63.40

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Solution

The fourth proportional to 91, 125.70 and 63.40 is: 87.58

Step by Step Solution

  1. Step 1: Write the proportion equation
    91 : 125.70 = 63.40 : x
  2. Step 2: Convert to fraction form
    91/125.70 = 63.40/x
  3. Step 3: Cross multiply
    91x = 125.70 × 63.40
  4. Step 4: Simplify right side
    91x = 7,969.38
  5. Step 5: Solve for x
    x = 7,969.38/91
  6. Step 6: Final answer
    x = 87.58

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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.