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Finding the Fourth Proportional to 91, 125.62 and 68.04

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Solution

The fourth proportional to 91, 125.62 and 68.04 is: 93.93

Step by Step Solution

  1. Step 1: Write the proportion equation
    91 : 125.62 = 68.04 : x
  2. Step 2: Convert to fraction form
    91/125.62 = 68.04/x
  3. Step 3: Cross multiply
    91x = 125.62 × 68.04
  4. Step 4: Simplify right side
    91x = 8,547.18
  5. Step 5: Solve for x
    x = 8,547.18/91
  6. Step 6: Final answer
    x = 93.93

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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.