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Finding the Fourth Proportional to 613.99, 847.43 and 403.80

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Solution

The fourth proportional to 613.99, 847.43 and 403.80 is: 557.33

Step by Step Solution

  1. Step 1: Write the proportion equation
    613.99 : 847.43 = 403.80 : x
  2. Step 2: Convert to fraction form
    613.99/847.43 = 403.80/x
  3. Step 3: Cross multiply
    613.99x = 847.43 × 403.80
  4. Step 4: Simplify right side
    613.99x = 342,192.23
  5. Step 5: Solve for x
    x = 342,192.23/613.99
  6. Step 6: Final answer
    x = 557.33

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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.