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Finding the Fourth Proportional to 1,129.32, 1,694.49 and 436.14

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Solution

The fourth proportional to 1,129.32, 1,694.49 and 436.14 is: 654.41

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,129.32 : 1,694.49 = 436.14 : x
  2. Step 2: Convert to fraction form
    1,129.32/1,694.49 = 436.14/x
  3. Step 3: Cross multiply
    1,129.32x = 1,694.49 × 436.14
  4. Step 4: Simplify right side
    1,129.32x = 739,034.87
  5. Step 5: Solve for x
    x = 739,034.87/1,129.32
  6. Step 6: Final answer
    x = 654.41

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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.