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Finding the Fourth Proportional to 1,163.79, 1,605.54 and 666.31

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Solution

The fourth proportional to 1,163.79, 1,605.54 and 666.31 is: 919.23

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,163.79 : 1,605.54 = 666.31 : x
  2. Step 2: Convert to fraction form
    1,163.79/1,605.54 = 666.31/x
  3. Step 3: Cross multiply
    1,163.79x = 1,605.54 × 666.31
  4. Step 4: Simplify right side
    1,163.79x = 1,069,787.36
  5. Step 5: Solve for x
    x = 1,069,787.36/1,163.79
  6. Step 6: Final answer
    x = 919.23

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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.