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Finding the Fourth Proportional to 8,479.88, 12,701.40 and 4,780.16

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Solution

The fourth proportional to 8,479.88, 12,701.40 and 4,780.16 is: 7,159.86

Step by Step Solution

  1. Step 1: Write the proportion equation
    8,479.88 : 12,701.40 = 4,780.16 : x
  2. Step 2: Convert to fraction form
    8,479.88/12,701.40 = 4,780.16/x
  3. Step 3: Cross multiply
    8,479.88x = 12,701.40 × 4,780.16
  4. Step 4: Simplify right side
    8,479.88x = 60,714,724.22
  5. Step 5: Solve for x
    x = 60,714,724.22/8,479.88
  6. Step 6: Final answer
    x = 7,159.86

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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.