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Finding the Fourth Proportional to 13,999.70, 20,999.55 and 8,470.10

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Solution

The fourth proportional to 13,999.70, 20,999.55 and 8,470.10 is: 12,705.15

Step by Step Solution

  1. Step 1: Write the proportion equation
    13,999.70 : 20,999.55 = 8,470.10 : x
  2. Step 2: Convert to fraction form
    13,999.70/20,999.55 = 8,470.10/x
  3. Step 3: Cross multiply
    13,999.70x = 20,999.55 × 8,470.10
  4. Step 4: Simplify right side
    13,999.70x = 177,868,288.46
  5. Step 5: Solve for x
    x = 177,868,288.46/13,999.70
  6. Step 6: Final answer
    x = 12,705.15

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.