Home / 100,385.15-138,529.13-55,062.72

Finding the Fourth Proportional to 100,385.15, 138,529.13 and 55,062.72

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Solution

The fourth proportional to 100,385.15, 138,529.13 and 55,062.72 is: 75,985.25

Step by Step Solution

  1. Step 1: Write the proportion equation
    100,385.15 : 138,529.13 = 55,062.72 : x
  2. Step 2: Convert to fraction form
    100,385.15/138,529.13 = 55,062.72/x
  3. Step 3: Cross multiply
    100,385.15x = 138,529.13 × 55,062.72
  4. Step 4: Simplify right side
    100,385.15x = 7,627,790,421.72
  5. Step 5: Solve for x
    x = 7,627,790,421.72/100,385.15
  6. Step 6: Final answer
    x = 75,985.25

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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.