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Finding the Fourth Proportional to 8,319.76, 12,480.12 and 3,125.68

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Solution

The fourth proportional to 8,319.76, 12,480.12 and 3,125.68 is: 4,688.70

Step by Step Solution

  1. Step 1: Write the proportion equation
    8,319.76 : 12,480.12 = 3,125.68 : x
  2. Step 2: Convert to fraction form
    8,319.76/12,480.12 = 3,125.68/x
  3. Step 3: Cross multiply
    8,319.76x = 12,480.12 × 3,125.68
  4. Step 4: Simplify right side
    8,319.76x = 39,008,861.48
  5. Step 5: Solve for x
    x = 39,008,861.48/8,319.76
  6. Step 6: Final answer
    x = 4,688.70

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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.