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Finding the Fourth Proportional to 28,628.70, 42,947.10 and 8,905.20

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Solution

The fourth proportional to 28,628.70, 42,947.10 and 8,905.20 is: 13,359.06

Step by Step Solution

  1. Step 1: Write the proportion equation
    28,628.70 : 42,947.10 = 8,905.20 : x
  2. Step 2: Convert to fraction form
    28,628.70/42,947.10 = 8,905.20/x
  3. Step 3: Cross multiply
    28,628.70x = 42,947.10 × 8,905.20
  4. Step 4: Simplify right side
    28,628.70x = 382,452,514.92
  5. Step 5: Solve for x
    x = 382,452,514.92/28,628.70
  6. Step 6: Final answer
    x = 13,359.06

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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.