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Finding the Fourth Proportional to 8,479.84, 11,698.80 and 5,121.76

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Solution

The fourth proportional to 8,479.84, 11,698.80 and 5,121.76 is: 7,065.99

Step by Step Solution

  1. Step 1: Write the proportion equation
    8,479.84 : 11,698.80 = 5,121.76 : x
  2. Step 2: Convert to fraction form
    8,479.84/11,698.80 = 5,121.76/x
  3. Step 3: Cross multiply
    8,479.84x = 11,698.80 × 5,121.76
  4. Step 4: Simplify right side
    8,479.84x = 59,918,445.89
  5. Step 5: Solve for x
    x = 59,918,445.89/8,479.84
  6. Step 6: Final answer
    x = 7,065.99

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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.