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Finding the Fourth Proportional to 1,163, 1,604.76 and 665.66

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Solution

The fourth proportional to 1,163, 1,604.76 and 665.66 is: 918.51

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,163 : 1,604.76 = 665.66 : x
  2. Step 2: Convert to fraction form
    1,163/1,604.76 = 665.66/x
  3. Step 3: Cross multiply
    1,163x = 1,604.76 × 665.66
  4. Step 4: Simplify right side
    1,163x = 1,068,224.54
  5. Step 5: Solve for x
    x = 1,068,224.54/1,163
  6. Step 6: Final answer
    x = 918.51

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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.