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Finding the Fourth Proportional to 28,758.40, 43,161.90 and 11,240.80

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Solution

The fourth proportional to 28,758.40, 43,161.90 and 11,240.80 is: 16,870.70

Step by Step Solution

  1. Step 1: Write the proportion equation
    28,758.40 : 43,161.90 = 11,240.80 : x
  2. Step 2: Convert to fraction form
    28,758.40/43,161.90 = 11,240.80/x
  3. Step 3: Cross multiply
    28,758.40x = 43,161.90 × 11,240.80
  4. Step 4: Simplify right side
    28,758.40x = 485,174,285.52
  5. Step 5: Solve for x
    x = 485,174,285.52/28,758.40
  6. Step 6: Final answer
    x = 16,870.70

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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.