Home / 81,278.68-121,918.02-34,498.78

Finding the Fourth Proportional to 81,278.68, 121,918.02 and 34,498.78

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Solution

The fourth proportional to 81,278.68, 121,918.02 and 34,498.78 is: 51,748.17

Step by Step Solution

  1. Step 1: Write the proportion equation
    81,278.68 : 121,918.02 = 34,498.78 : x
  2. Step 2: Convert to fraction form
    81,278.68/121,918.02 = 34,498.78/x
  3. Step 3: Cross multiply
    81,278.68x = 121,918.02 × 34,498.78
  4. Step 4: Simplify right side
    81,278.68x = 4,206,022,950.02
  5. Step 5: Solve for x
    x = 4,206,022,950.02/81,278.68
  6. Step 6: Final answer
    x = 51,748.17

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1.5x scale

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.