Home / 18,420.48-25,432.20-12,687.60

Finding the Fourth Proportional to 18,420.48, 25,432.20 and 12,687.60

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Solution

The fourth proportional to 18,420.48, 25,432.20 and 12,687.60 is: 17,517.11

Step by Step Solution

  1. Step 1: Write the proportion equation
    18,420.48 : 25,432.20 = 12,687.60 : x
  2. Step 2: Convert to fraction form
    18,420.48/25,432.20 = 12,687.60/x
  3. Step 3: Cross multiply
    18,420.48x = 25,432.20 × 12,687.60
  4. Step 4: Simplify right side
    18,420.48x = 322,673,580.72
  5. Step 5: Solve for x
    x = 322,673,580.72/18,420.48
  6. Step 6: Final answer
    x = 17,517.11

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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.