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Finding the Fourth Proportional to 100,373.29, 138,515.13 and 55,661.29

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Solution

The fourth proportional to 100,373.29, 138,515.13 and 55,661.29 is: 76,812.57

Step by Step Solution

  1. Step 1: Write the proportion equation
    100,373.29 : 138,515.13 = 55,661.29 : x
  2. Step 2: Convert to fraction form
    100,373.29/138,515.13 = 55,661.29/x
  3. Step 3: Cross multiply
    100,373.29x = 138,515.13 × 55,661.29
  4. Step 4: Simplify right side
    100,373.29x = 7,709,930,820.32
  5. Step 5: Solve for x
    x = 7,709,930,820.32/100,373.29
  6. Step 6: Final answer
    x = 76,812.57

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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.