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Finding the Fourth Proportional to 28,617.70, 42,930.60 and 8,894.20

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Solution

The fourth proportional to 28,617.70, 42,930.60 and 8,894.20 is: 13,342.56

Step by Step Solution

  1. Step 1: Write the proportion equation
    28,617.70 : 42,930.60 = 8,894.20 : x
  2. Step 2: Convert to fraction form
    28,617.70/42,930.60 = 8,894.20/x
  3. Step 3: Cross multiply
    28,617.70x = 42,930.60 × 8,894.20
  4. Step 4: Simplify right side
    28,617.70x = 381,833,342.52
  5. Step 5: Solve for x
    x = 381,833,342.52/28,617.70
  6. Step 6: Final answer
    x = 13,342.56

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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.