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Finding the Fourth Proportional to 8,278.88, 12,425.60 and 6,981.24

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Solution

The fourth proportional to 8,278.88, 12,425.60 and 6,981.24 is: 10,478.00

Step by Step Solution

  1. Step 1: Write the proportion equation
    8,278.88 : 12,425.60 = 6,981.24 : x
  2. Step 2: Convert to fraction form
    8,278.88/12,425.60 = 6,981.24/x
  3. Step 3: Cross multiply
    8,278.88x = 12,425.60 × 6,981.24
  4. Step 4: Simplify right side
    8,278.88x = 86,746,095.74
  5. Step 5: Solve for x
    x = 86,746,095.74/8,278.88
  6. Step 6: Final answer
    x = 10,478.00

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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.