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Finding the Fourth Proportional to 4,612.60, 6,921.60 and 1,691.20

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Solution

The fourth proportional to 4,612.60, 6,921.60 and 1,691.20 is: 2,537.79

Step by Step Solution

  1. Step 1: Write the proportion equation
    4,612.60 : 6,921.60 = 1,691.20 : x
  2. Step 2: Convert to fraction form
    4,612.60/6,921.60 = 1,691.20/x
  3. Step 3: Cross multiply
    4,612.60x = 6,921.60 × 1,691.20
  4. Step 4: Simplify right side
    4,612.60x = 11,705,809.92
  5. Step 5: Solve for x
    x = 11,705,809.92/4,612.60
  6. Step 6: Final answer
    x = 2,537.79

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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.