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Finding the Fourth Proportional to 100,303.88, 138,422.90 and 54,981.85

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Solution

The fourth proportional to 100,303.88, 138,422.90 and 54,981.85 is: 75,876.90

Step by Step Solution

  1. Step 1: Write the proportion equation
    100,303.88 : 138,422.90 = 54,981.85 : x
  2. Step 2: Convert to fraction form
    100,303.88/138,422.90 = 54,981.85/x
  3. Step 3: Cross multiply
    100,303.88x = 138,422.90 × 54,981.85
  4. Step 4: Simplify right side
    100,303.88x = 7,610,747,389.29
  5. Step 5: Solve for x
    x = 7,610,747,389.29/100,303.88
  6. Step 6: Final answer
    x = 75,876.90

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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.