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Finding the Fourth Proportional to 1,163.48, 1,605.63 and 666.28

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Solution

The fourth proportional to 1,163.48, 1,605.63 and 666.28 is: 919.48

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,163.48 : 1,605.63 = 666.28 : x
  2. Step 2: Convert to fraction form
    1,163.48/1,605.63 = 666.28/x
  3. Step 3: Cross multiply
    1,163.48x = 1,605.63 × 666.28
  4. Step 4: Simplify right side
    1,163.48x = 1,069,795.14
  5. Step 5: Solve for x
    x = 1,069,795.14/1,163.48
  6. Step 6: Final answer
    x = 919.48

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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.