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Finding the Fourth Proportional to 12,988.25, 17,923.78 and 7,019.92

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Solution

The fourth proportional to 12,988.25, 17,923.78 and 7,019.92 is: 9,687.48

Step by Step Solution

  1. Step 1: Write the proportion equation
    12,988.25 : 17,923.78 = 7,019.92 : x
  2. Step 2: Convert to fraction form
    12,988.25/17,923.78 = 7,019.92/x
  3. Step 3: Cross multiply
    12,988.25x = 17,923.78 × 7,019.92
  4. Step 4: Simplify right side
    12,988.25x = 125,823,432.06
  5. Step 5: Solve for x
    x = 125,823,432.06/12,988.25
  6. Step 6: Final answer
    x = 9,687.48

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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.