Home / 10,991.20-15,160.52-7,017.28

Finding the Fourth Proportional to 10,991.20, 15,160.52 and 7,017.28

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Solution

The fourth proportional to 10,991.20, 15,160.52 and 7,017.28 is: 9,679.16

Step by Step Solution

  1. Step 1: Write the proportion equation
    10,991.20 : 15,160.52 = 7,017.28 : x
  2. Step 2: Convert to fraction form
    10,991.20/15,160.52 = 7,017.28/x
  3. Step 3: Cross multiply
    10,991.20x = 15,160.52 × 7,017.28
  4. Step 4: Simplify right side
    10,991.20x = 106,385,613.79
  5. Step 5: Solve for x
    x = 106,385,613.79/10,991.20
  6. Step 6: Final answer
    x = 9,679.16

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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.