Home / 15,438.71-21,305.15-8,724.20

Finding the Fourth Proportional to 15,438.71, 21,305.15 and 8,724.20

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Solution

The fourth proportional to 15,438.71, 21,305.15 and 8,724.20 is: 12,039.23

Step by Step Solution

  1. Step 1: Write the proportion equation
    15,438.71 : 21,305.15 = 8,724.20 : x
  2. Step 2: Convert to fraction form
    15,438.71/21,305.15 = 8,724.20/x
  3. Step 3: Cross multiply
    15,438.71x = 21,305.15 × 8,724.20
  4. Step 4: Simplify right side
    15,438.71x = 185,870,239.48
  5. Step 5: Solve for x
    x = 185,870,239.48/15,438.71
  6. Step 6: Final answer
    x = 12,039.23

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.