Home / 20,438.61-28,207.89-12,479.15

Finding the Fourth Proportional to 20,438.61, 28,207.89 and 12,479.15

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Solution

The fourth proportional to 20,438.61, 28,207.89 and 12,479.15 is: 17,222.82

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,438.61 : 28,207.89 = 12,479.15 : x
  2. Step 2: Convert to fraction form
    20,438.61/28,207.89 = 12,479.15/x
  3. Step 3: Cross multiply
    20,438.61x = 28,207.89 × 12,479.15
  4. Step 4: Simplify right side
    20,438.61x = 352,010,490.49
  5. Step 5: Solve for x
    x = 352,010,490.49/20,438.61
  6. Step 6: Final answer
    x = 17,222.82

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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.