Home / 81,158.90-121,738.35-53,165.30

Finding the Fourth Proportional to 81,158.90, 121,738.35 and 53,165.30

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Solution

The fourth proportional to 81,158.90, 121,738.35 and 53,165.30 is: 79,747.95

Step by Step Solution

  1. Step 1: Write the proportion equation
    81,158.90 : 121,738.35 = 53,165.30 : x
  2. Step 2: Convert to fraction form
    81,158.90/121,738.35 = 53,165.30/x
  3. Step 3: Cross multiply
    81,158.90x = 121,738.35 × 53,165.30
  4. Step 4: Simplify right side
    81,158.90x = 6,472,255,899.26
  5. Step 5: Solve for x
    x = 6,472,255,899.26/81,158.90
  6. Step 6: Final answer
    x = 79,747.95

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.