Home / 100,315.26-138,432.24-54,990.90

Finding the Fourth Proportional to 100,315.26, 138,432.24 and 54,990.90

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Solution

The fourth proportional to 100,315.26, 138,432.24 and 54,990.90 is: 75,885.90

Step by Step Solution

  1. Step 1: Write the proportion equation
    100,315.26 : 138,432.24 = 54,990.90 : x
  2. Step 2: Convert to fraction form
    100,315.26/138,432.24 = 54,990.90/x
  3. Step 3: Cross multiply
    100,315.26x = 138,432.24 × 54,990.90
  4. Step 4: Simplify right side
    100,315.26x = 7,612,513,466.62
  5. Step 5: Solve for x
    x = 7,612,513,466.62/100,315.26
  6. Step 6: Final answer
    x = 75,885.90

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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.