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Finding the Fourth Proportional to 1,318.02, 1,978.26 and 669.24

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Solution

The fourth proportional to 1,318.02, 1,978.26 and 669.24 is: 1,004.48

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,318.02 : 1,978.26 = 669.24 : x
  2. Step 2: Convert to fraction form
    1,318.02/1,978.26 = 669.24/x
  3. Step 3: Cross multiply
    1,318.02x = 1,978.26 × 669.24
  4. Step 4: Simplify right side
    1,318.02x = 1,323,930.72
  5. Step 5: Solve for x
    x = 1,323,930.72/1,318.02
  6. Step 6: Final answer
    x = 1,004.48

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.