Home / 81,320.90-121,981.35-53,417.30

Finding the Fourth Proportional to 81,320.90, 121,981.35 and 53,417.30

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Solution

The fourth proportional to 81,320.90, 121,981.35 and 53,417.30 is: 80,125.95

Step by Step Solution

  1. Step 1: Write the proportion equation
    81,320.90 : 121,981.35 = 53,417.30 : x
  2. Step 2: Convert to fraction form
    81,320.90/121,981.35 = 53,417.30/x
  3. Step 3: Cross multiply
    81,320.90x = 121,981.35 × 53,417.30
  4. Step 4: Simplify right side
    81,320.90x = 6,515,914,367.36
  5. Step 5: Solve for x
    x = 6,515,914,367.36/81,320.90
  6. Step 6: Final answer
    x = 80,125.95

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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.