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Finding the Fourth Proportional to 561.09, 774.28 and 312.41

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Solution

The fourth proportional to 561.09, 774.28 and 312.41 is: 431.11

Step by Step Solution

  1. Step 1: Write the proportion equation
    561.09 : 774.28 = 312.41 : x
  2. Step 2: Convert to fraction form
    561.09/774.28 = 312.41/x
  3. Step 3: Cross multiply
    561.09x = 774.28 × 312.41
  4. Step 4: Simplify right side
    561.09x = 241,892.81
  5. Step 5: Solve for x
    x = 241,892.81/561.09
  6. Step 6: Final answer
    x = 431.11

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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.