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Finding the Fourth Proportional to 669.02, 1,005.15 and 426.02

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Solution

The fourth proportional to 669.02, 1,005.15 and 426.02 is: 640.06

Step by Step Solution

  1. Step 1: Write the proportion equation
    669.02 : 1,005.15 = 426.02 : x
  2. Step 2: Convert to fraction form
    669.02/1,005.15 = 426.02/x
  3. Step 3: Cross multiply
    669.02x = 1,005.15 × 426.02
  4. Step 4: Simplify right side
    669.02x = 428,214.00
  5. Step 5: Solve for x
    x = 428,214.00/669.02
  6. Step 6: Final answer
    x = 640.06

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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.