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Finding the Fourth Proportional to 1,131.20, 1,697.20 and 400.80

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Solution

The fourth proportional to 1,131.20, 1,697.20 and 400.80 is: 601.34

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,131.20 : 1,697.20 = 400.80 : x
  2. Step 2: Convert to fraction form
    1,131.20/1,697.20 = 400.80/x
  3. Step 3: Cross multiply
    1,131.20x = 1,697.20 × 400.80
  4. Step 4: Simplify right side
    1,131.20x = 680,237.76
  5. Step 5: Solve for x
    x = 680,237.76/1,131.20
  6. Step 6: Final answer
    x = 601.34

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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.