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Finding the Fourth Proportional to 1,162.57, 1,604.45 and 665.11

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Solution

The fourth proportional to 1,162.57, 1,604.45 and 665.11 is: 917.91

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,162.57 : 1,604.45 = 665.11 : x
  2. Step 2: Convert to fraction form
    1,162.57/1,604.45 = 665.11/x
  3. Step 3: Cross multiply
    1,162.57x = 1,604.45 × 665.11
  4. Step 4: Simplify right side
    1,162.57x = 1,067,135.74
  5. Step 5: Solve for x
    x = 1,067,135.74/1,162.57
  6. Step 6: Final answer
    x = 917.91

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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.