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Finding the Fourth Proportional to 1,078.19, 1,487.82 and 679.91

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Solution

The fourth proportional to 1,078.19, 1,487.82 and 679.91 is: 938.22

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,078.19 : 1,487.82 = 679.91 : x
  2. Step 2: Convert to fraction form
    1,078.19/1,487.82 = 679.91/x
  3. Step 3: Cross multiply
    1,078.19x = 1,487.82 × 679.91
  4. Step 4: Simplify right side
    1,078.19x = 1,011,583.70
  5. Step 5: Solve for x
    x = 1,011,583.70/1,078.19
  6. Step 6: Final answer
    x = 938.22

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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.