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Finding the Fourth Proportional to 10,288.80, 15,424.20 and 6,991.20

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Solution

The fourth proportional to 10,288.80, 15,424.20 and 6,991.20 is: 10,480.68

Step by Step Solution

  1. Step 1: Write the proportion equation
    10,288.80 : 15,424.20 = 6,991.20 : x
  2. Step 2: Convert to fraction form
    10,288.80/15,424.20 = 6,991.20/x
  3. Step 3: Cross multiply
    10,288.80x = 15,424.20 × 6,991.20
  4. Step 4: Simplify right side
    10,288.80x = 107,833,667.04
  5. Step 5: Solve for x
    x = 107,833,667.04/10,288.80
  6. Step 6: Final answer
    x = 10,480.68

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.