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Finding the Fourth Proportional to 403.99, 560.05 and 383.20

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Solution

The fourth proportional to 403.99, 560.05 and 383.20 is: 531.23

Step by Step Solution

  1. Step 1: Write the proportion equation
    403.99 : 560.05 = 383.20 : x
  2. Step 2: Convert to fraction form
    403.99/560.05 = 383.20/x
  3. Step 3: Cross multiply
    403.99x = 560.05 × 383.20
  4. Step 4: Simplify right side
    403.99x = 214,608.80
  5. Step 5: Solve for x
    x = 214,608.80/403.99
  6. Step 6: Final answer
    x = 531.23

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Why These Related Problems?

These problems maintain the same ratio (1.39) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.