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Finding the Fourth Proportional to 697.68, 1,045.44 and 408.78

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Solution

The fourth proportional to 697.68, 1,045.44 and 408.78 is: 612.54

Step by Step Solution

  1. Step 1: Write the proportion equation
    697.68 : 1,045.44 = 408.78 : x
  2. Step 2: Convert to fraction form
    697.68/1,045.44 = 408.78/x
  3. Step 3: Cross multiply
    697.68x = 1,045.44 × 408.78
  4. Step 4: Simplify right side
    697.68x = 427,354.96
  5. Step 5: Solve for x
    x = 427,354.96/697.68
  6. Step 6: Final answer
    x = 612.54

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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.