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Finding the Fourth Proportional to 12,478.78, 17,220.72 and 6,889.78

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Solution

The fourth proportional to 12,478.78, 17,220.72 and 6,889.78 is: 9,507.90

Step by Step Solution

  1. Step 1: Write the proportion equation
    12,478.78 : 17,220.72 = 6,889.78 : x
  2. Step 2: Convert to fraction form
    12,478.78/17,220.72 = 6,889.78/x
  3. Step 3: Cross multiply
    12,478.78x = 17,220.72 × 6,889.78
  4. Step 4: Simplify right side
    12,478.78x = 118,646,972.24
  5. Step 5: Solve for x
    x = 118,646,972.24/12,478.78
  6. Step 6: Final answer
    x = 9,507.90

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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.