Home / 80,965.36-120,643.16-72,132.40

Finding the Fourth Proportional to 80,965.36, 120,643.16 and 72,132.40

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Solution

The fourth proportional to 80,965.36, 120,643.16 and 72,132.40 is: 107,481.53

Step by Step Solution

  1. Step 1: Write the proportion equation
    80,965.36 : 120,643.16 = 72,132.40 : x
  2. Step 2: Convert to fraction form
    80,965.36/120,643.16 = 72,132.40/x
  3. Step 3: Cross multiply
    80,965.36x = 120,643.16 × 72,132.40
  4. Step 4: Simplify right side
    80,965.36x = 8,702,280,674.38
  5. Step 5: Solve for x
    x = 8,702,280,674.38/80,965.36
  6. Step 6: Final answer
    x = 107,481.53

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Why These Related Problems?

These problems maintain the same ratio (1.49) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.