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Finding the Fourth Proportional to 1,089.56, 1,634.97 and 431.49

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Solution

The fourth proportional to 1,089.56, 1,634.97 and 431.49 is: 647.49

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,089.56 : 1,634.97 = 431.49 : x
  2. Step 2: Convert to fraction form
    1,089.56/1,634.97 = 431.49/x
  3. Step 3: Cross multiply
    1,089.56x = 1,634.97 × 431.49
  4. Step 4: Simplify right side
    1,089.56x = 705,473.21
  5. Step 5: Solve for x
    x = 705,473.21/1,089.56
  6. Step 6: Final answer
    x = 647.49

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Double scale
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1.5x scale

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.