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Finding the Fourth Proportional to 561.15, 774.08 and 328.11

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Solution

The fourth proportional to 561.15, 774.08 and 328.11 is: 452.61

Step by Step Solution

  1. Step 1: Write the proportion equation
    561.15 : 774.08 = 328.11 : x
  2. Step 2: Convert to fraction form
    561.15/774.08 = 328.11/x
  3. Step 3: Cross multiply
    561.15x = 774.08 × 328.11
  4. Step 4: Simplify right side
    561.15x = 253,981.75
  5. Step 5: Solve for x
    x = 253,981.75/561.15
  6. Step 6: Final answer
    x = 452.61

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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.