Home / 86,426.28-129,639.39-20,762.28

Finding the Fourth Proportional to 86,426.28, 129,639.39 and 20,762.28

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Solution

The fourth proportional to 86,426.28, 129,639.39 and 20,762.28 is: 31,143.41

Step by Step Solution

  1. Step 1: Write the proportion equation
    86,426.28 : 129,639.39 = 20,762.28 : x
  2. Step 2: Convert to fraction form
    86,426.28/129,639.39 = 20,762.28/x
  3. Step 3: Cross multiply
    86,426.28x = 129,639.39 × 20,762.28
  4. Step 4: Simplify right side
    86,426.28x = 2,691,609,314.21
  5. Step 5: Solve for x
    x = 2,691,609,314.21/86,426.28
  6. Step 6: Final answer
    x = 31,143.41

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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.