Home / 81,322.20-121,983.30-66,547.80

Finding the Fourth Proportional to 81,322.20, 121,983.30 and 66,547.80

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Solution

The fourth proportional to 81,322.20, 121,983.30 and 66,547.80 is: 99,821.70

Step by Step Solution

  1. Step 1: Write the proportion equation
    81,322.20 : 121,983.30 = 66,547.80 : x
  2. Step 2: Convert to fraction form
    81,322.20/121,983.30 = 66,547.80/x
  3. Step 3: Cross multiply
    81,322.20x = 121,983.30 × 66,547.80
  4. Step 4: Simplify right side
    81,322.20x = 8,117,720,251.74
  5. Step 5: Solve for x
    x = 8,117,720,251.74/81,322.20
  6. Step 6: Final answer
    x = 99,821.70

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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.