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Finding the Fourth Proportional to 100,554.48, 138,740.28 and 56,947.74

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Solution

The fourth proportional to 100,554.48, 138,740.28 and 56,947.74 is: 78,573.78

Step by Step Solution

  1. Step 1: Write the proportion equation
    100,554.48 : 138,740.28 = 56,947.74 : x
  2. Step 2: Convert to fraction form
    100,554.48/138,740.28 = 56,947.74/x
  3. Step 3: Cross multiply
    100,554.48x = 138,740.28 × 56,947.74
  4. Step 4: Simplify right side
    100,554.48x = 7,900,945,392.97
  5. Step 5: Solve for x
    x = 7,900,945,392.97/100,554.48
  6. Step 6: Final answer
    x = 78,573.78

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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.