Home / 86,521.24-129,781.62-20,857.24

Finding the Fourth Proportional to 86,521.24, 129,781.62 and 20,857.24

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Solution

The fourth proportional to 86,521.24, 129,781.62 and 20,857.24 is: 31,285.80

Step by Step Solution

  1. Step 1: Write the proportion equation
    86,521.24 : 129,781.62 = 20,857.24 : x
  2. Step 2: Convert to fraction form
    86,521.24/129,781.62 = 20,857.24/x
  3. Step 3: Cross multiply
    86,521.24x = 129,781.62 × 20,857.24
  4. Step 4: Simplify right side
    86,521.24x = 2,706,886,395.93
  5. Step 5: Solve for x
    x = 2,706,886,395.93/86,521.24
  6. Step 6: Final answer
    x = 31,285.80

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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.