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Finding the Fourth Proportional to 1,118.70, 1,679.85 and 812.70

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Solution

The fourth proportional to 1,118.70, 1,679.85 and 812.70 is: 1,220.36

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,118.70 : 1,679.85 = 812.70 : x
  2. Step 2: Convert to fraction form
    1,118.70/1,679.85 = 812.70/x
  3. Step 3: Cross multiply
    1,118.70x = 1,679.85 × 812.70
  4. Step 4: Simplify right side
    1,118.70x = 1,365,214.10
  5. Step 5: Solve for x
    x = 1,365,214.10/1,118.70
  6. Step 6: Final answer
    x = 1,220.36

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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.