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Finding the Fourth Proportional to 12,479.57, 17,221.80 and 6,890.57

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Solution

The fourth proportional to 12,479.57, 17,221.80 and 6,890.57 is: 9,508.98

Step by Step Solution

  1. Step 1: Write the proportion equation
    12,479.57 : 17,221.80 = 6,890.57 : x
  2. Step 2: Convert to fraction form
    12,479.57/17,221.80 = 6,890.57/x
  3. Step 3: Cross multiply
    12,479.57x = 17,221.80 × 6,890.57
  4. Step 4: Simplify right side
    12,479.57x = 118,667,897.86
  5. Step 5: Solve for x
    x = 118,667,897.86/12,479.57
  6. Step 6: Final answer
    x = 9,508.98

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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.