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Finding the Fourth Proportional to 91.16, 125.81 and 52.35

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Solution

The fourth proportional to 91.16, 125.81 and 52.35 is: 72.25

Step by Step Solution

  1. Step 1: Write the proportion equation
    91.16 : 125.81 = 52.35 : x
  2. Step 2: Convert to fraction form
    91.16/125.81 = 52.35/x
  3. Step 3: Cross multiply
    91.16x = 125.81 × 52.35
  4. Step 4: Simplify right side
    91.16x = 6,586.15
  5. Step 5: Solve for x
    x = 6,586.15/91.16
  6. Step 6: Final answer
    x = 72.25

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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.