Home / 100,438.20-138,606.17-55,115.37

Finding the Fourth Proportional to 100,438.20, 138,606.17 and 55,115.37

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Solution

The fourth proportional to 100,438.20, 138,606.17 and 55,115.37 is: 76,060.01

Step by Step Solution

  1. Step 1: Write the proportion equation
    100,438.20 : 138,606.17 = 55,115.37 : x
  2. Step 2: Convert to fraction form
    100,438.20/138,606.17 = 55,115.37/x
  3. Step 3: Cross multiply
    100,438.20x = 138,606.17 × 55,115.37
  4. Step 4: Simplify right side
    100,438.20x = 7,639,330,068.26
  5. Step 5: Solve for x
    x = 7,639,330,068.26/100,438.20
  6. Step 6: Final answer
    x = 76,060.01

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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.