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Finding the Fourth Proportional to 1,008.28, 1,390.90 and 676.72

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Solution

The fourth proportional to 1,008.28, 1,390.90 and 676.72 is: 933.52

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,008.28 : 1,390.90 = 676.72 : x
  2. Step 2: Convert to fraction form
    1,008.28/1,390.90 = 676.72/x
  3. Step 3: Cross multiply
    1,008.28x = 1,390.90 × 676.72
  4. Step 4: Simplify right side
    1,008.28x = 941,249.85
  5. Step 5: Solve for x
    x = 941,249.85/1,008.28
  6. Step 6: Final answer
    x = 933.52

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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.