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Finding the Fourth Proportional to 1,131.99, 1,697.17 and 438.06

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Solution

The fourth proportional to 1,131.99, 1,697.17 and 438.06 is: 656.77

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,131.99 : 1,697.17 = 438.06 : x
  2. Step 2: Convert to fraction form
    1,131.99/1,697.17 = 438.06/x
  3. Step 3: Cross multiply
    1,131.99x = 1,697.17 × 438.06
  4. Step 4: Simplify right side
    1,131.99x = 743,462.29
  5. Step 5: Solve for x
    x = 743,462.29/1,131.99
  6. Step 6: Final answer
    x = 656.77

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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.