Home / 20,750.39-31,125.51-12,432.90

Finding the Fourth Proportional to 20,750.39, 31,125.51 and 12,432.90

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Solution

The fourth proportional to 20,750.39, 31,125.51 and 12,432.90 is: 18,649.31

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,750.39 : 31,125.51 = 12,432.90 : x
  2. Step 2: Convert to fraction form
    20,750.39/31,125.51 = 12,432.90/x
  3. Step 3: Cross multiply
    20,750.39x = 31,125.51 × 12,432.90
  4. Step 4: Simplify right side
    20,750.39x = 386,980,353.28
  5. Step 5: Solve for x
    x = 386,980,353.28/20,750.39
  6. Step 6: Final answer
    x = 18,649.31

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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.