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Finding the Fourth Proportional to 12,478.52, 18,711.52 and 4,155.61

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Solution

The fourth proportional to 12,478.52, 18,711.52 and 4,155.61 is: 6,231.33

Step by Step Solution

  1. Step 1: Write the proportion equation
    12,478.52 : 18,711.52 = 4,155.61 : x
  2. Step 2: Convert to fraction form
    12,478.52/18,711.52 = 4,155.61/x
  3. Step 3: Cross multiply
    12,478.52x = 18,711.52 × 4,155.61
  4. Step 4: Simplify right side
    12,478.52x = 77,757,779.63
  5. Step 5: Solve for x
    x = 77,757,779.63/12,478.52
  6. Step 6: Final answer
    x = 6,231.33

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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.