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Finding the Fourth Proportional to 12,479.52, 17,220.96 and 6,890.64

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Solution

The fourth proportional to 12,479.52, 17,220.96 and 6,890.64 is: 9,508.65

Step by Step Solution

  1. Step 1: Write the proportion equation
    12,479.52 : 17,220.96 = 6,890.64 : x
  2. Step 2: Convert to fraction form
    12,479.52/17,220.96 = 6,890.64/x
  3. Step 3: Cross multiply
    12,479.52x = 17,220.96 × 6,890.64
  4. Step 4: Simplify right side
    12,479.52x = 118,663,435.81
  5. Step 5: Solve for x
    x = 118,663,435.81/12,479.52
  6. Step 6: Final answer
    x = 9,508.65

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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.