Home / 13,687.20-20,479.60-12,458.40

Finding the Fourth Proportional to 13,687.20, 20,479.60 and 12,458.40

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Solution

The fourth proportional to 13,687.20, 20,479.60 and 12,458.40 is: 18,641.00

Step by Step Solution

  1. Step 1: Write the proportion equation
    13,687.20 : 20,479.60 = 12,458.40 : x
  2. Step 2: Convert to fraction form
    13,687.20/20,479.60 = 12,458.40/x
  3. Step 3: Cross multiply
    13,687.20x = 20,479.60 × 12,458.40
  4. Step 4: Simplify right side
    13,687.20x = 255,143,048.64
  5. Step 5: Solve for x
    x = 255,143,048.64/13,687.20
  6. Step 6: Final answer
    x = 18,641.00

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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.