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Finding the Fourth Proportional to 669.24, 1,002.78 and 493.20

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Solution

The fourth proportional to 669.24, 1,002.78 and 493.20 is: 739.00

Step by Step Solution

  1. Step 1: Write the proportion equation
    669.24 : 1,002.78 = 493.20 : x
  2. Step 2: Convert to fraction form
    669.24/1,002.78 = 493.20/x
  3. Step 3: Cross multiply
    669.24x = 1,002.78 × 493.20
  4. Step 4: Simplify right side
    669.24x = 494,571.10
  5. Step 5: Solve for x
    x = 494,571.10/669.24
  6. Step 6: Final answer
    x = 739.00

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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.