Home / 20,612.40-28,411.92-16,128.96

Finding the Fourth Proportional to 20,612.40, 28,411.92 and 16,128.96

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Solution

The fourth proportional to 20,612.40, 28,411.92 and 16,128.96 is: 22,231.99

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,612.40 : 28,411.92 = 16,128.96 : x
  2. Step 2: Convert to fraction form
    20,612.40/28,411.92 = 16,128.96/x
  3. Step 3: Cross multiply
    20,612.40x = 28,411.92 × 16,128.96
  4. Step 4: Simplify right side
    20,612.40x = 458,254,721.20
  5. Step 5: Solve for x
    x = 458,254,721.20/20,612.40
  6. Step 6: Final answer
    x = 22,231.99

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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.