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Finding the Fourth Proportional to 1,087.61, 1,631.41 and 429.46

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Solution

The fourth proportional to 1,087.61, 1,631.41 and 429.46 is: 644.19

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,087.61 : 1,631.41 = 429.46 : x
  2. Step 2: Convert to fraction form
    1,087.61/1,631.41 = 429.46/x
  3. Step 3: Cross multiply
    1,087.61x = 1,631.41 × 429.46
  4. Step 4: Simplify right side
    1,087.61x = 700,620.19
  5. Step 5: Solve for x
    x = 700,620.19/1,087.61
  6. Step 6: Final answer
    x = 644.19

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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.