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Finding the Fourth Proportional to 1,171.19, 1,616.19 and 640.08

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Solution

The fourth proportional to 1,171.19, 1,616.19 and 640.08 is: 883.28

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,171.19 : 1,616.19 = 640.08 : x
  2. Step 2: Convert to fraction form
    1,171.19/1,616.19 = 640.08/x
  3. Step 3: Cross multiply
    1,171.19x = 1,616.19 × 640.08
  4. Step 4: Simplify right side
    1,171.19x = 1,034,488.49
  5. Step 5: Solve for x
    x = 1,034,488.49/1,171.19
  6. Step 6: Final answer
    x = 883.28

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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.