Home / 91,318.36-136,988.46-38,721

Finding the Fourth Proportional to 91,318.36, 136,988.46 and 38,721

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Solution

The fourth proportional to 91,318.36, 136,988.46 and 38,721 is: 58,086.13

Step by Step Solution

  1. Step 1: Write the proportion equation
    91,318.36 : 136,988.46 = 38,721 : x
  2. Step 2: Convert to fraction form
    91,318.36/136,988.46 = 38,721/x
  3. Step 3: Cross multiply
    91,318.36x = 136,988.46 × 38,721
  4. Step 4: Simplify right side
    91,318.36x = 5,304,330,159.66
  5. Step 5: Solve for x
    x = 5,304,330,159.66/91,318.36
  6. Step 6: Final answer
    x = 58,086.13

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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.