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Finding the Fourth Proportional to 12,636.55, 18,959.74 and 5,239.13

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Solution

The fourth proportional to 12,636.55, 18,959.74 and 5,239.13 is: 7,860.72

Step by Step Solution

  1. Step 1: Write the proportion equation
    12,636.55 : 18,959.74 = 5,239.13 : x
  2. Step 2: Convert to fraction form
    12,636.55/18,959.74 = 5,239.13/x
  3. Step 3: Cross multiply
    12,636.55x = 18,959.74 × 5,239.13
  4. Step 4: Simplify right side
    12,636.55x = 99,332,434.73
  5. Step 5: Solve for x
    x = 99,332,434.73/12,636.55
  6. Step 6: Final answer
    x = 7,860.72

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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.