Home / 15,439.40-21,309.87-8,728.92

Finding the Fourth Proportional to 15,439.40, 21,309.87 and 8,728.92

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Solution

The fourth proportional to 15,439.40, 21,309.87 and 8,728.92 is: 12,047.89

Step by Step Solution

  1. Step 1: Write the proportion equation
    15,439.40 : 21,309.87 = 8,728.92 : x
  2. Step 2: Convert to fraction form
    15,439.40/21,309.87 = 8,728.92/x
  3. Step 3: Cross multiply
    15,439.40x = 21,309.87 × 8,728.92
  4. Step 4: Simplify right side
    15,439.40x = 186,012,150.44
  5. Step 5: Solve for x
    x = 186,012,150.44/15,439.40
  6. Step 6: Final answer
    x = 12,047.89

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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.