Home / 20,390.92-28,139.51-11,898.88

Finding the Fourth Proportional to 20,390.92, 28,139.51 and 11,898.88

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Solution

The fourth proportional to 20,390.92, 28,139.51 and 11,898.88 is: 16,420.48

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,390.92 : 28,139.51 = 11,898.88 : x
  2. Step 2: Convert to fraction form
    20,390.92/28,139.51 = 11,898.88/x
  3. Step 3: Cross multiply
    20,390.92x = 28,139.51 × 11,898.88
  4. Step 4: Simplify right side
    20,390.92x = 334,828,612.15
  5. Step 5: Solve for x
    x = 334,828,612.15/20,390.92
  6. Step 6: Final answer
    x = 16,420.48

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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.