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Finding the Fourth Proportional to 1,107.36, 1,527.84 and 641.52

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Solution

The fourth proportional to 1,107.36, 1,527.84 and 641.52 is: 885.11

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,107.36 : 1,527.84 = 641.52 : x
  2. Step 2: Convert to fraction form
    1,107.36/1,527.84 = 641.52/x
  3. Step 3: Cross multiply
    1,107.36x = 1,527.84 × 641.52
  4. Step 4: Simplify right side
    1,107.36x = 980,139.92
  5. Step 5: Solve for x
    x = 980,139.92/1,107.36
  6. Step 6: Final answer
    x = 885.11

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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.