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Finding the Fourth Proportional to 614.50, 847.78 and 404.78

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Solution

The fourth proportional to 614.50, 847.78 and 404.78 is: 558.44

Step by Step Solution

  1. Step 1: Write the proportion equation
    614.50 : 847.78 = 404.78 : x
  2. Step 2: Convert to fraction form
    614.50/847.78 = 404.78/x
  3. Step 3: Cross multiply
    614.50x = 847.78 × 404.78
  4. Step 4: Simplify right side
    614.50x = 343,159.14
  5. Step 5: Solve for x
    x = 343,159.14/614.50
  6. Step 6: Final answer
    x = 558.44

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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.