Home / 85,853.20-128,779.80-82,572.70

Finding the Fourth Proportional to 85,853.20, 128,779.80 and 82,572.70

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Solution

The fourth proportional to 85,853.20, 128,779.80 and 82,572.70 is: 123,859.05

Step by Step Solution

  1. Step 1: Write the proportion equation
    85,853.20 : 128,779.80 = 82,572.70 : x
  2. Step 2: Convert to fraction form
    85,853.20/128,779.80 = 82,572.70/x
  3. Step 3: Cross multiply
    85,853.20x = 128,779.80 × 82,572.70
  4. Step 4: Simplify right side
    85,853.20x = 10,633,695,791.46
  5. Step 5: Solve for x
    x = 10,633,695,791.46/85,853.20
  6. Step 6: Final answer
    x = 123,859.05

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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.