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Finding the Fourth Proportional to 1,174.30, 1,620.50 and 643.18

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Solution

The fourth proportional to 1,174.30, 1,620.50 and 643.18 is: 887.56

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,174.30 : 1,620.50 = 643.18 : x
  2. Step 2: Convert to fraction form
    1,174.30/1,620.50 = 643.18/x
  3. Step 3: Cross multiply
    1,174.30x = 1,620.50 × 643.18
  4. Step 4: Simplify right side
    1,174.30x = 1,042,261.87
  5. Step 5: Solve for x
    x = 1,042,261.87/1,174.30
  6. Step 6: Final answer
    x = 887.56

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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.