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Finding the Fourth Proportional to 842.08, 1,261.68 and 679.84

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Solution

The fourth proportional to 842.08, 1,261.68 and 679.84 is: 1,018.60

Step by Step Solution

  1. Step 1: Write the proportion equation
    842.08 : 1,261.68 = 679.84 : x
  2. Step 2: Convert to fraction form
    842.08/1,261.68 = 679.84/x
  3. Step 3: Cross multiply
    842.08x = 1,261.68 × 679.84
  4. Step 4: Simplify right side
    842.08x = 857,740.53
  5. Step 5: Solve for x
    x = 857,740.53/842.08
  6. Step 6: Final answer
    x = 1,018.60

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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.