Home / 100,420.56-138,592.20-55,711.44

Finding the Fourth Proportional to 100,420.56, 138,592.20 and 55,711.44

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Solution

The fourth proportional to 100,420.56, 138,592.20 and 55,711.44 is: 76,888.35

Step by Step Solution

  1. Step 1: Write the proportion equation
    100,420.56 : 138,592.20 = 55,711.44 : x
  2. Step 2: Convert to fraction form
    100,420.56/138,592.20 = 55,711.44/x
  3. Step 3: Cross multiply
    100,420.56x = 138,592.20 × 55,711.44
  4. Step 4: Simplify right side
    100,420.56x = 7,721,171,034.77
  5. Step 5: Solve for x
    x = 7,721,171,034.77/100,420.56
  6. Step 6: Final answer
    x = 76,888.35

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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.