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Finding the Fourth Proportional to 8,721.69, 12,040.53 and 7,001.48

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Solution

The fourth proportional to 8,721.69, 12,040.53 and 7,001.48 is: 9,665.73

Step by Step Solution

  1. Step 1: Write the proportion equation
    8,721.69 : 12,040.53 = 7,001.48 : x
  2. Step 2: Convert to fraction form
    8,721.69/12,040.53 = 7,001.48/x
  3. Step 3: Cross multiply
    8,721.69x = 12,040.53 × 7,001.48
  4. Step 4: Simplify right side
    8,721.69x = 84,301,469.78
  5. Step 5: Solve for x
    x = 84,301,469.78/8,721.69
  6. Step 6: Final answer
    x = 9,665.73

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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.