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Finding the Fourth Proportional to 1,086.40, 1,631.40 and 722.80

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Solution

The fourth proportional to 1,086.40, 1,631.40 and 722.80 is: 1,085.40

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,086.40 : 1,631.40 = 722.80 : x
  2. Step 2: Convert to fraction form
    1,086.40/1,631.40 = 722.80/x
  3. Step 3: Cross multiply
    1,086.40x = 1,631.40 × 722.80
  4. Step 4: Simplify right side
    1,086.40x = 1,179,175.92
  5. Step 5: Solve for x
    x = 1,179,175.92/1,086.40
  6. Step 6: Final answer
    x = 1,085.40

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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.