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Finding the Fourth Proportional to 10,789.20, 16,110.90 and 9,331.20

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Solution

The fourth proportional to 10,789.20, 16,110.90 and 9,331.20 is: 13,933.75

Step by Step Solution

  1. Step 1: Write the proportion equation
    10,789.20 : 16,110.90 = 9,331.20 : x
  2. Step 2: Convert to fraction form
    10,789.20/16,110.90 = 9,331.20/x
  3. Step 3: Cross multiply
    10,789.20x = 16,110.90 × 9,331.20
  4. Step 4: Simplify right side
    10,789.20x = 150,334,030.08
  5. Step 5: Solve for x
    x = 150,334,030.08/10,789.20
  6. Step 6: Final answer
    x = 13,933.75

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.49) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.