Home / 12,456.90-17,180.80-7,981.07

Finding the Fourth Proportional to 12,456.90, 17,180.80 and 7,981.07

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Solution

The fourth proportional to 12,456.90, 17,180.80 and 7,981.07 is: 11,007.65

Step by Step Solution

  1. Step 1: Write the proportion equation
    12,456.90 : 17,180.80 = 7,981.07 : x
  2. Step 2: Convert to fraction form
    12,456.90/17,180.80 = 7,981.07/x
  3. Step 3: Cross multiply
    12,456.90x = 17,180.80 × 7,981.07
  4. Step 4: Simplify right side
    12,456.90x = 137,121,167.46
  5. Step 5: Solve for x
    x = 137,121,167.46/12,456.90
  6. Step 6: Final answer
    x = 11,007.65

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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.