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Finding the Fourth Proportional to 18,440.76, 25,440.14 and 12,470.28

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Solution

The fourth proportional to 18,440.76, 25,440.14 and 12,470.28 is: 17,203.50

Step by Step Solution

  1. Step 1: Write the proportion equation
    18,440.76 : 25,440.14 = 12,470.28 : x
  2. Step 2: Convert to fraction form
    18,440.76/25,440.14 = 12,470.28/x
  3. Step 3: Cross multiply
    18,440.76x = 25,440.14 × 12,470.28
  4. Step 4: Simplify right side
    18,440.76x = 317,245,669.04
  5. Step 5: Solve for x
    x = 317,245,669.04/18,440.76
  6. Step 6: Final answer
    x = 17,203.50

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Half scale
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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.