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Finding the Fourth Proportional to 1,165.18, 1,607.97 and 641.23

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Solution

The fourth proportional to 1,165.18, 1,607.97 and 641.23 is: 884.91

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,165.18 : 1,607.97 = 641.23 : x
  2. Step 2: Convert to fraction form
    1,165.18/1,607.97 = 641.23/x
  3. Step 3: Cross multiply
    1,165.18x = 1,607.97 × 641.23
  4. Step 4: Simplify right side
    1,165.18x = 1,031,078.60
  5. Step 5: Solve for x
    x = 1,031,078.60/1,165.18
  6. Step 6: Final answer
    x = 884.91

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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.