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Finding the Fourth Proportional to 1,109.14, 1,530.57 and 643.39

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Solution

The fourth proportional to 1,109.14, 1,530.57 and 643.39 is: 887.85

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,109.14 : 1,530.57 = 643.39 : x
  2. Step 2: Convert to fraction form
    1,109.14/1,530.57 = 643.39/x
  3. Step 3: Cross multiply
    1,109.14x = 1,530.57 × 643.39
  4. Step 4: Simplify right side
    1,109.14x = 984,753.43
  5. Step 5: Solve for x
    x = 984,753.43/1,109.14
  6. Step 6: Final answer
    x = 887.85

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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.