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Finding the Fourth Proportional to 28,918.70, 43,378.05 and 8,142.20

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Solution

The fourth proportional to 28,918.70, 43,378.05 and 8,142.20 is: 12,213.30

Step by Step Solution

  1. Step 1: Write the proportion equation
    28,918.70 : 43,378.05 = 8,142.20 : x
  2. Step 2: Convert to fraction form
    28,918.70/43,378.05 = 8,142.20/x
  3. Step 3: Cross multiply
    28,918.70x = 43,378.05 × 8,142.20
  4. Step 4: Simplify right side
    28,918.70x = 353,192,758.71
  5. Step 5: Solve for x
    x = 353,192,758.71/28,918.70
  6. Step 6: Final answer
    x = 12,213.30

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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.