Home / 100,436.38-138,601.80-55,115.12

Finding the Fourth Proportional to 100,436.38, 138,601.80 and 55,115.12

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Solution

The fourth proportional to 100,436.38, 138,601.80 and 55,115.12 is: 76,058.64

Step by Step Solution

  1. Step 1: Write the proportion equation
    100,436.38 : 138,601.80 = 55,115.12 : x
  2. Step 2: Convert to fraction form
    100,436.38/138,601.80 = 55,115.12/x
  3. Step 3: Cross multiply
    100,436.38x = 138,601.80 × 55,115.12
  4. Step 4: Simplify right side
    100,436.38x = 7,639,054,839.22
  5. Step 5: Solve for x
    x = 7,639,054,839.22/100,436.38
  6. Step 6: Final answer
    x = 76,058.64

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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.