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Finding the Fourth Proportional to 1,087.82, 1,632 and 429.74

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Solution

The fourth proportional to 1,087.82, 1,632 and 429.74 is: 644.72

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,087.82 : 1,632 = 429.74 : x
  2. Step 2: Convert to fraction form
    1,087.82/1,632 = 429.74/x
  3. Step 3: Cross multiply
    1,087.82x = 1,632 × 429.74
  4. Step 4: Simplify right side
    1,087.82x = 701,335.68
  5. Step 5: Solve for x
    x = 701,335.68/1,087.82
  6. Step 6: Final answer
    x = 644.72

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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.