Home / 85,821.80-129,078.30-76,836.20

Finding the Fourth Proportional to 85,821.80, 129,078.30 and 76,836.20

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Solution

The fourth proportional to 85,821.80, 129,078.30 and 76,836.20 is: 115,563.72

Step by Step Solution

  1. Step 1: Write the proportion equation
    85,821.80 : 129,078.30 = 76,836.20 : x
  2. Step 2: Convert to fraction form
    85,821.80/129,078.30 = 76,836.20/x
  3. Step 3: Cross multiply
    85,821.80x = 129,078.30 × 76,836.20
  4. Step 4: Simplify right side
    85,821.80x = 9,917,886,074.46
  5. Step 5: Solve for x
    x = 9,917,886,074.46/85,821.80
  6. Step 6: Final answer
    x = 115,563.72

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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.