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Finding the Fourth Proportional to 697.39, 1,045.40 and 404.78

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Solution

The fourth proportional to 697.39, 1,045.40 and 404.78 is: 606.76

Step by Step Solution

  1. Step 1: Write the proportion equation
    697.39 : 1,045.40 = 404.78 : x
  2. Step 2: Convert to fraction form
    697.39/1,045.40 = 404.78/x
  3. Step 3: Cross multiply
    697.39x = 1,045.40 × 404.78
  4. Step 4: Simplify right side
    697.39x = 423,149.76
  5. Step 5: Solve for x
    x = 423,149.76/697.39
  6. Step 6: Final answer
    x = 606.76

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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.