Home / 100,640.18-138,886.80-55,319.78

Finding the Fourth Proportional to 100,640.18, 138,886.80 and 55,319.78

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Solution

The fourth proportional to 100,640.18, 138,886.80 and 55,319.78 is: 76,343.14

Step by Step Solution

  1. Step 1: Write the proportion equation
    100,640.18 : 138,886.80 = 55,319.78 : x
  2. Step 2: Convert to fraction form
    100,640.18/138,886.80 = 55,319.78/x
  3. Step 3: Cross multiply
    100,640.18x = 138,886.80 × 55,319.78
  4. Step 4: Simplify right side
    100,640.18x = 7,683,187,220.90
  5. Step 5: Solve for x
    x = 7,683,187,220.90/100,640.18
  6. Step 6: Final answer
    x = 76,343.14

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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.