Home / 86,619.88-129,929.81-20,955.88

Finding the Fourth Proportional to 86,619.88, 129,929.81 and 20,955.88

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Solution

The fourth proportional to 86,619.88, 129,929.81 and 20,955.88 is: 31,433.82

Step by Step Solution

  1. Step 1: Write the proportion equation
    86,619.88 : 129,929.81 = 20,955.88 : x
  2. Step 2: Convert to fraction form
    86,619.88/129,929.81 = 20,955.88/x
  3. Step 3: Cross multiply
    86,619.88x = 129,929.81 × 20,955.88
  4. Step 4: Simplify right side
    86,619.88x = 2,722,793,506.78
  5. Step 5: Solve for x
    x = 2,722,793,506.78/86,619.88
  6. Step 6: Final answer
    x = 31,433.82

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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.