Home / 86,403.13-129,604.69-20,739.13

Finding the Fourth Proportional to 86,403.13, 129,604.69 and 20,739.13

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Solution

The fourth proportional to 86,403.13, 129,604.69 and 20,739.13 is: 31,108.69

Step by Step Solution

  1. Step 1: Write the proportion equation
    86,403.13 : 129,604.69 = 20,739.13 : x
  2. Step 2: Convert to fraction form
    86,403.13/129,604.69 = 20,739.13/x
  3. Step 3: Cross multiply
    86,403.13x = 129,604.69 × 20,739.13
  4. Step 4: Simplify right side
    86,403.13x = 2,687,888,514.52
  5. Step 5: Solve for x
    x = 2,687,888,514.52/86,403.13
  6. Step 6: Final answer
    x = 31,108.69

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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.