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Finding the Fourth Proportional to 100,155.78, 138,214.92 and 57,738.90

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Solution

The fourth proportional to 100,155.78, 138,214.92 and 57,738.90 is: 79,679.65

Step by Step Solution

  1. Step 1: Write the proportion equation
    100,155.78 : 138,214.92 = 57,738.90 : x
  2. Step 2: Convert to fraction form
    100,155.78/138,214.92 = 57,738.90/x
  3. Step 3: Cross multiply
    100,155.78x = 138,214.92 × 57,738.90
  4. Step 4: Simplify right side
    100,155.78x = 7,980,377,444.39
  5. Step 5: Solve for x
    x = 7,980,377,444.39/100,155.78
  6. Step 6: Final answer
    x = 79,679.65

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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.