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Finding the Fourth Proportional to 669.94, 1,005.75 and 487.54

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Solution

The fourth proportional to 669.94, 1,005.75 and 487.54 is: 731.92

Step by Step Solution

  1. Step 1: Write the proportion equation
    669.94 : 1,005.75 = 487.54 : x
  2. Step 2: Convert to fraction form
    669.94/1,005.75 = 487.54/x
  3. Step 3: Cross multiply
    669.94x = 1,005.75 × 487.54
  4. Step 4: Simplify right side
    669.94x = 490,343.36
  5. Step 5: Solve for x
    x = 490,343.36/669.94
  6. Step 6: Final answer
    x = 731.92

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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.