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Finding the Fourth Proportional to 12,721.40, 17,555.52 and 7,132.40

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Solution

The fourth proportional to 12,721.40, 17,555.52 and 7,132.40 is: 9,842.71

Step by Step Solution

  1. Step 1: Write the proportion equation
    12,721.40 : 17,555.52 = 7,132.40 : x
  2. Step 2: Convert to fraction form
    12,721.40/17,555.52 = 7,132.40/x
  3. Step 3: Cross multiply
    12,721.40x = 17,555.52 × 7,132.40
  4. Step 4: Simplify right side
    12,721.40x = 125,212,990.85
  5. Step 5: Solve for x
    x = 125,212,990.85/12,721.40
  6. Step 6: Final answer
    x = 9,842.71

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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.