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Finding the Fourth Proportional to 905.12, 1,248.42 and 555.96

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Solution

The fourth proportional to 905.12, 1,248.42 and 555.96 is: 766.83

Step by Step Solution

  1. Step 1: Write the proportion equation
    905.12 : 1,248.42 = 555.96 : x
  2. Step 2: Convert to fraction form
    905.12/1,248.42 = 555.96/x
  3. Step 3: Cross multiply
    905.12x = 1,248.42 × 555.96
  4. Step 4: Simplify right side
    905.12x = 694,071.58
  5. Step 5: Solve for x
    x = 694,071.58/905.12
  6. Step 6: Final answer
    x = 766.83

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.