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Finding the Fourth Proportional to 1,248.64, 1,872.96 and 518.32

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Solution

The fourth proportional to 1,248.64, 1,872.96 and 518.32 is: 777.48

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,248.64 : 1,872.96 = 518.32 : x
  2. Step 2: Convert to fraction form
    1,248.64/1,872.96 = 518.32/x
  3. Step 3: Cross multiply
    1,248.64x = 1,872.96 × 518.32
  4. Step 4: Simplify right side
    1,248.64x = 970,792.63
  5. Step 5: Solve for x
    x = 970,792.63/1,248.64
  6. Step 6: Final answer
    x = 777.48

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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.