Home / 13,421.90-20,132.85-8,432.30

Finding the Fourth Proportional to 13,421.90, 20,132.85 and 8,432.30

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Solution

The fourth proportional to 13,421.90, 20,132.85 and 8,432.30 is: 12,648.45

Step by Step Solution

  1. Step 1: Write the proportion equation
    13,421.90 : 20,132.85 = 8,432.30 : x
  2. Step 2: Convert to fraction form
    13,421.90/20,132.85 = 8,432.30/x
  3. Step 3: Cross multiply
    13,421.90x = 20,132.85 × 8,432.30
  4. Step 4: Simplify right side
    13,421.90x = 169,766,231.06
  5. Step 5: Solve for x
    x = 169,766,231.06/13,421.90
  6. Step 6: Final answer
    x = 12,648.45

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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.