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Finding the Fourth Proportional to 11,320.80, 16,981.20 and 9,133.80

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Solution

The fourth proportional to 11,320.80, 16,981.20 and 9,133.80 is: 13,700.70

Step by Step Solution

  1. Step 1: Write the proportion equation
    11,320.80 : 16,981.20 = 9,133.80 : x
  2. Step 2: Convert to fraction form
    11,320.80/16,981.20 = 9,133.80/x
  3. Step 3: Cross multiply
    11,320.80x = 16,981.20 × 9,133.80
  4. Step 4: Simplify right side
    11,320.80x = 155,102,884.56
  5. Step 5: Solve for x
    x = 155,102,884.56/11,320.80
  6. Step 6: Final answer
    x = 13,700.70

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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.