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Finding the Fourth Proportional to 10,939.20, 16,408.80 and 10,334.40

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Solution

The fourth proportional to 10,939.20, 16,408.80 and 10,334.40 is: 15,501.60

Step by Step Solution

  1. Step 1: Write the proportion equation
    10,939.20 : 16,408.80 = 10,334.40 : x
  2. Step 2: Convert to fraction form
    10,939.20/16,408.80 = 10,334.40/x
  3. Step 3: Cross multiply
    10,939.20x = 16,408.80 × 10,334.40
  4. Step 4: Simplify right side
    10,939.20x = 169,575,102.72
  5. Step 5: Solve for x
    x = 169,575,102.72/10,939.20
  6. Step 6: Final answer
    x = 15,501.60

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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.