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Finding the Fourth Proportional to 670.71, 1,005.12 and 633.75

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Solution

The fourth proportional to 670.71, 1,005.12 and 633.75 is: 949.73

Step by Step Solution

  1. Step 1: Write the proportion equation
    670.71 : 1,005.12 = 633.75 : x
  2. Step 2: Convert to fraction form
    670.71/1,005.12 = 633.75/x
  3. Step 3: Cross multiply
    670.71x = 1,005.12 × 633.75
  4. Step 4: Simplify right side
    670.71x = 636,994.80
  5. Step 5: Solve for x
    x = 636,994.80/670.71
  6. Step 6: Final answer
    x = 949.73

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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.