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Finding the Fourth Proportional to 91,138, 136,712.12 and 25,479.12

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Solution

The fourth proportional to 91,138, 136,712.12 and 25,479.12 is: 38,220.11

Step by Step Solution

  1. Step 1: Write the proportion equation
    91,138 : 136,712.12 = 25,479.12 : x
  2. Step 2: Convert to fraction form
    91,138/136,712.12 = 25,479.12/x
  3. Step 3: Cross multiply
    91,138x = 136,712.12 × 25,479.12
  4. Step 4: Simplify right side
    91,138x = 3,483,304,510.93
  5. Step 5: Solve for x
    x = 3,483,304,510.93/91,138
  6. Step 6: Final answer
    x = 38,220.11

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.