Home / 15,427.20-21,289.42-8,712.80

Finding the Fourth Proportional to 15,427.20, 21,289.42 and 8,712.80

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Solution

The fourth proportional to 15,427.20, 21,289.42 and 8,712.80 is: 12,023.60

Step by Step Solution

  1. Step 1: Write the proportion equation
    15,427.20 : 21,289.42 = 8,712.80 : x
  2. Step 2: Convert to fraction form
    15,427.20/21,289.42 = 8,712.80/x
  3. Step 3: Cross multiply
    15,427.20x = 21,289.42 × 8,712.80
  4. Step 4: Simplify right side
    15,427.20x = 185,490,458.58
  5. Step 5: Solve for x
    x = 185,490,458.58/15,427.20
  6. Step 6: Final answer
    x = 12,023.60

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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.