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Finding the Fourth Proportional to 1,029.84, 1,421.34 and 676.78

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Solution

The fourth proportional to 1,029.84, 1,421.34 and 676.78 is: 934.06

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,029.84 : 1,421.34 = 676.78 : x
  2. Step 2: Convert to fraction form
    1,029.84/1,421.34 = 676.78/x
  3. Step 3: Cross multiply
    1,029.84x = 1,421.34 × 676.78
  4. Step 4: Simplify right side
    1,029.84x = 961,931.10
  5. Step 5: Solve for x
    x = 961,931.10/1,029.84
  6. Step 6: Final answer
    x = 934.06

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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.