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Finding the Fourth Proportional to 1,163.40, 1,605.45 and 665.69

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Solution

The fourth proportional to 1,163.40, 1,605.45 and 665.69 is: 918.62

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,163.40 : 1,605.45 = 665.69 : x
  2. Step 2: Convert to fraction form
    1,163.40/1,605.45 = 665.69/x
  3. Step 3: Cross multiply
    1,163.40x = 1,605.45 × 665.69
  4. Step 4: Simplify right side
    1,163.40x = 1,068,728.46
  5. Step 5: Solve for x
    x = 1,068,728.46/1,163.40
  6. Step 6: Final answer
    x = 918.62

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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.