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Finding the Fourth Proportional to 1,087.84, 1,631.44 and 307.65

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Solution

The fourth proportional to 1,087.84, 1,631.44 and 307.65 is: 461.38

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,087.84 : 1,631.44 = 307.65 : x
  2. Step 2: Convert to fraction form
    1,087.84/1,631.44 = 307.65/x
  3. Step 3: Cross multiply
    1,087.84x = 1,631.44 × 307.65
  4. Step 4: Simplify right side
    1,087.84x = 501,912.52
  5. Step 5: Solve for x
    x = 501,912.52/1,087.84
  6. Step 6: Final answer
    x = 461.38

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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.