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Finding the Fourth Proportional to 668.49, 1,000.90 and 448.81

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Solution

The fourth proportional to 668.49, 1,000.90 and 448.81 is: 671.98

Step by Step Solution

  1. Step 1: Write the proportion equation
    668.49 : 1,000.90 = 448.81 : x
  2. Step 2: Convert to fraction form
    668.49/1,000.90 = 448.81/x
  3. Step 3: Cross multiply
    668.49x = 1,000.90 × 448.81
  4. Step 4: Simplify right side
    668.49x = 449,206.68
  5. Step 5: Solve for x
    x = 449,206.68/668.49
  6. Step 6: Final answer
    x = 671.98

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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.