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Finding the Fourth Proportional to 561.15, 774.38 and 312.49

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Solution

The fourth proportional to 561.15, 774.38 and 312.49 is: 431.23

Step by Step Solution

  1. Step 1: Write the proportion equation
    561.15 : 774.38 = 312.49 : x
  2. Step 2: Convert to fraction form
    561.15/774.38 = 312.49/x
  3. Step 3: Cross multiply
    561.15x = 774.38 × 312.49
  4. Step 4: Simplify right side
    561.15x = 241,983.68
  5. Step 5: Solve for x
    x = 241,983.68/561.15
  6. Step 6: Final answer
    x = 431.23

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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.