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Finding the Fourth Proportional to 697.30, 1,045.94 and 408.53

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Solution

The fourth proportional to 697.30, 1,045.94 and 408.53 is: 612.79

Step by Step Solution

  1. Step 1: Write the proportion equation
    697.30 : 1,045.94 = 408.53 : x
  2. Step 2: Convert to fraction form
    697.30/1,045.94 = 408.53/x
  3. Step 3: Cross multiply
    697.30x = 1,045.94 × 408.53
  4. Step 4: Simplify right side
    697.30x = 427,298.44
  5. Step 5: Solve for x
    x = 427,298.44/697.30
  6. Step 6: Final answer
    x = 612.79

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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.