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Finding the Fourth Proportional to 1,006.67, 1,388.85 and 633.68

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Solution

The fourth proportional to 1,006.67, 1,388.85 and 633.68 is: 874.25

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,006.67 : 1,388.85 = 633.68 : x
  2. Step 2: Convert to fraction form
    1,006.67/1,388.85 = 633.68/x
  3. Step 3: Cross multiply
    1,006.67x = 1,388.85 × 633.68
  4. Step 4: Simplify right side
    1,006.67x = 880,079.52
  5. Step 5: Solve for x
    x = 880,079.52/1,006.67
  6. Step 6: Final answer
    x = 874.25

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.