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Finding the Fourth Proportional to 1,086.14, 1,497.52 and 643.88

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Solution

The fourth proportional to 1,086.14, 1,497.52 and 643.88 is: 887.75

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,086.14 : 1,497.52 = 643.88 : x
  2. Step 2: Convert to fraction form
    1,086.14/1,497.52 = 643.88/x
  3. Step 3: Cross multiply
    1,086.14x = 1,497.52 × 643.88
  4. Step 4: Simplify right side
    1,086.14x = 964,227.73
  5. Step 5: Solve for x
    x = 964,227.73/1,086.14
  6. Step 6: Final answer
    x = 887.75

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.