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Finding the Fourth Proportional to 12,471.79, 18,707.67 and 8,319.90

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Solution

The fourth proportional to 12,471.79, 18,707.67 and 8,319.90 is: 12,479.84

Step by Step Solution

  1. Step 1: Write the proportion equation
    12,471.79 : 18,707.67 = 8,319.90 : x
  2. Step 2: Convert to fraction form
    12,471.79/18,707.67 = 8,319.90/x
  3. Step 3: Cross multiply
    12,471.79x = 18,707.67 × 8,319.90
  4. Step 4: Simplify right side
    12,471.79x = 155,645,943.63
  5. Step 5: Solve for x
    x = 155,645,943.63/12,471.79
  6. Step 6: Final answer
    x = 12,479.84

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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.