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Finding the Fourth Proportional to 11,165.40, 16,728.90 and 9,437.40

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Solution

The fourth proportional to 11,165.40, 16,728.90 and 9,437.40 is: 14,139.87

Step by Step Solution

  1. Step 1: Write the proportion equation
    11,165.40 : 16,728.90 = 9,437.40 : x
  2. Step 2: Convert to fraction form
    11,165.40/16,728.90 = 9,437.40/x
  3. Step 3: Cross multiply
    11,165.40x = 16,728.90 × 9,437.40
  4. Step 4: Simplify right side
    11,165.40x = 157,877,320.86
  5. Step 5: Solve for x
    x = 157,877,320.86/11,165.40
  6. Step 6: Final answer
    x = 14,139.87

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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.