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Finding the Fourth Proportional to 674.20, 1,011.30 and 625.60

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Solution

The fourth proportional to 674.20, 1,011.30 and 625.60 is: 938.40

Step by Step Solution

  1. Step 1: Write the proportion equation
    674.20 : 1,011.30 = 625.60 : x
  2. Step 2: Convert to fraction form
    674.20/1,011.30 = 625.60/x
  3. Step 3: Cross multiply
    674.20x = 1,011.30 × 625.60
  4. Step 4: Simplify right side
    674.20x = 632,669.28
  5. Step 5: Solve for x
    x = 632,669.28/674.20
  6. Step 6: Final answer
    x = 938.40

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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.