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Finding the Fourth Proportional to 403.88, 561.02 and 392.36

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Solution

The fourth proportional to 403.88, 561.02 and 392.36 is: 545.02

Step by Step Solution

  1. Step 1: Write the proportion equation
    403.88 : 561.02 = 392.36 : x
  2. Step 2: Convert to fraction form
    403.88/561.02 = 392.36/x
  3. Step 3: Cross multiply
    403.88x = 561.02 × 392.36
  4. Step 4: Simplify right side
    403.88x = 220,121.81
  5. Step 5: Solve for x
    x = 220,121.81/403.88
  6. Step 6: Final answer
    x = 545.02

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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.