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Finding the Fourth Proportional to 561.19, 774.56 and 325.15

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Solution

The fourth proportional to 561.19, 774.56 and 325.15 is: 448.78

Step by Step Solution

  1. Step 1: Write the proportion equation
    561.19 : 774.56 = 325.15 : x
  2. Step 2: Convert to fraction form
    561.19/774.56 = 325.15/x
  3. Step 3: Cross multiply
    561.19x = 774.56 × 325.15
  4. Step 4: Simplify right side
    561.19x = 251,848.18
  5. Step 5: Solve for x
    x = 251,848.18/561.19
  6. Step 6: Final answer
    x = 448.78

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Double scale
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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.