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Finding the Fourth Proportional to 100,415, 138,572.70 and 55,711.64

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Solution

The fourth proportional to 100,415, 138,572.70 and 55,711.64 is: 76,882.06

Step by Step Solution

  1. Step 1: Write the proportion equation
    100,415 : 138,572.70 = 55,711.64 : x
  2. Step 2: Convert to fraction form
    100,415/138,572.70 = 55,711.64/x
  3. Step 3: Cross multiply
    100,415x = 138,572.70 × 55,711.64
  4. Step 4: Simplify right side
    100,415x = 7,720,112,376.23
  5. Step 5: Solve for x
    x = 7,720,112,376.23/100,415
  6. Step 6: Final answer
    x = 76,882.06

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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.