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Finding the Fourth Proportional to 669.40, 1,002.08 and 425.60

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Solution

The fourth proportional to 669.40, 1,002.08 and 425.60 is: 637.12

Step by Step Solution

  1. Step 1: Write the proportion equation
    669.40 : 1,002.08 = 425.60 : x
  2. Step 2: Convert to fraction form
    669.40/1,002.08 = 425.60/x
  3. Step 3: Cross multiply
    669.40x = 1,002.08 × 425.60
  4. Step 4: Simplify right side
    669.40x = 426,485.25
  5. Step 5: Solve for x
    x = 426,485.25/669.40
  6. Step 6: Final answer
    x = 637.12

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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.