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Finding the Fourth Proportional to 12,479.40, 17,220.06 and 6,890.04

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Solution

The fourth proportional to 12,479.40, 17,220.06 and 6,890.04 is: 9,507.42

Step by Step Solution

  1. Step 1: Write the proportion equation
    12,479.40 : 17,220.06 = 6,890.04 : x
  2. Step 2: Convert to fraction form
    12,479.40/17,220.06 = 6,890.04/x
  3. Step 3: Cross multiply
    12,479.40x = 17,220.06 × 6,890.04
  4. Step 4: Simplify right side
    12,479.40x = 118,646,902.20
  5. Step 5: Solve for x
    x = 118,646,902.20/12,479.40
  6. Step 6: Final answer
    x = 9,507.42

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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.