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Finding the Fourth Proportional to 12,787.61, 17,646.80 and 7,481.30

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Solution

The fourth proportional to 12,787.61, 17,646.80 and 7,481.30 is: 10,324.13

Step by Step Solution

  1. Step 1: Write the proportion equation
    12,787.61 : 17,646.80 = 7,481.30 : x
  2. Step 2: Convert to fraction form
    12,787.61/17,646.80 = 7,481.30/x
  3. Step 3: Cross multiply
    12,787.61x = 17,646.80 × 7,481.30
  4. Step 4: Simplify right side
    12,787.61x = 132,020,879.20
  5. Step 5: Solve for x
    x = 132,020,879.20/12,787.61
  6. Step 6: Final answer
    x = 10,324.13

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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.