Home / 20,976.04-28,939.08-12,478.47

Finding the Fourth Proportional to 20,976.04, 28,939.08 and 12,478.47

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Solution

The fourth proportional to 20,976.04, 28,939.08 and 12,478.47 is: 17,215.62

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,976.04 : 28,939.08 = 12,478.47 : x
  2. Step 2: Convert to fraction form
    20,976.04/28,939.08 = 12,478.47/x
  3. Step 3: Cross multiply
    20,976.04x = 28,939.08 × 12,478.47
  4. Step 4: Simplify right side
    20,976.04x = 361,115,441.61
  5. Step 5: Solve for x
    x = 361,115,441.61/20,976.04
  6. Step 6: Final answer
    x = 17,215.62

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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.