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Finding the Fourth Proportional to 100,376.62, 138,518.92 and 55,053.78

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Solution

The fourth proportional to 100,376.62, 138,518.92 and 55,053.78 is: 75,973.77

Step by Step Solution

  1. Step 1: Write the proportion equation
    100,376.62 : 138,518.92 = 55,053.78 : x
  2. Step 2: Convert to fraction form
    100,376.62/138,518.92 = 55,053.78/x
  3. Step 3: Cross multiply
    100,376.62x = 138,518.92 × 55,053.78
  4. Step 4: Simplify right side
    100,376.62x = 7,625,989,774.31
  5. Step 5: Solve for x
    x = 7,625,989,774.31/100,376.62
  6. Step 6: Final answer
    x = 75,973.77

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1.5x scale

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.