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Finding the Fourth Proportional to 1,163.34, 1,605.38 and 639.36

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Solution

The fourth proportional to 1,163.34, 1,605.38 and 639.36 is: 882.30

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,163.34 : 1,605.38 = 639.36 : x
  2. Step 2: Convert to fraction form
    1,163.34/1,605.38 = 639.36/x
  3. Step 3: Cross multiply
    1,163.34x = 1,605.38 × 639.36
  4. Step 4: Simplify right side
    1,163.34x = 1,026,415.76
  5. Step 5: Solve for x
    x = 1,026,415.76/1,163.34
  6. Step 6: Final answer
    x = 882.30

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1.5x scale

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.