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Finding the Fourth Proportional to 1,107.28, 1,528.08 and 641.50

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Solution

The fourth proportional to 1,107.28, 1,528.08 and 641.50 is: 885.29

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,107.28 : 1,528.08 = 641.50 : x
  2. Step 2: Convert to fraction form
    1,107.28/1,528.08 = 641.50/x
  3. Step 3: Cross multiply
    1,107.28x = 1,528.08 × 641.50
  4. Step 4: Simplify right side
    1,107.28x = 980,263.32
  5. Step 5: Solve for x
    x = 980,263.32/1,107.28
  6. Step 6: Final answer
    x = 885.29

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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.