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Finding the Fourth Proportional to 561.47, 774.86 and 325.40

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Solution

The fourth proportional to 561.47, 774.86 and 325.40 is: 449.06

Step by Step Solution

  1. Step 1: Write the proportion equation
    561.47 : 774.86 = 325.40 : x
  2. Step 2: Convert to fraction form
    561.47/774.86 = 325.40/x
  3. Step 3: Cross multiply
    561.47x = 774.86 × 325.40
  4. Step 4: Simplify right side
    561.47x = 252,133.94
  5. Step 5: Solve for x
    x = 252,133.94/561.47
  6. Step 6: Final answer
    x = 449.06

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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.