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Finding the Fourth Proportional to 714.05, 1,069.92 and 439.58

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Solution

The fourth proportional to 714.05, 1,069.92 and 439.58 is: 658.66

Step by Step Solution

  1. Step 1: Write the proportion equation
    714.05 : 1,069.92 = 439.58 : x
  2. Step 2: Convert to fraction form
    714.05/1,069.92 = 439.58/x
  3. Step 3: Cross multiply
    714.05x = 1,069.92 × 439.58
  4. Step 4: Simplify right side
    714.05x = 470,315.43
  5. Step 5: Solve for x
    x = 470,315.43/714.05
  6. Step 6: Final answer
    x = 658.66

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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.