Home / 20,638.20-28,480.74-11,206.74

Finding the Fourth Proportional to 20,638.20, 28,480.74 and 11,206.74

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Solution

The fourth proportional to 20,638.20, 28,480.74 and 11,206.74 is: 15,465.31

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,638.20 : 28,480.74 = 11,206.74 : x
  2. Step 2: Convert to fraction form
    20,638.20/28,480.74 = 11,206.74/x
  3. Step 3: Cross multiply
    20,638.20x = 28,480.74 × 11,206.74
  4. Step 4: Simplify right side
    20,638.20x = 319,176,248.19
  5. Step 5: Solve for x
    x = 319,176,248.19/20,638.20
  6. Step 6: Final answer
    x = 15,465.31

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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.