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Finding the Fourth Proportional to 12,479.35, 18,712.78 and 4,156.46

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Solution

The fourth proportional to 12,479.35, 18,712.78 and 4,156.46 is: 6,232.61

Step by Step Solution

  1. Step 1: Write the proportion equation
    12,479.35 : 18,712.78 = 4,156.46 : x
  2. Step 2: Convert to fraction form
    12,479.35/18,712.78 = 4,156.46/x
  3. Step 3: Cross multiply
    12,479.35x = 18,712.78 × 4,156.46
  4. Step 4: Simplify right side
    12,479.35x = 77,778,957.95
  5. Step 5: Solve for x
    x = 77,778,957.95/12,479.35
  6. Step 6: Final answer
    x = 6,232.61

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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.