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Finding the Fourth Proportional to 561.74, 775.08 and 328.88

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Solution

The fourth proportional to 561.74, 775.08 and 328.88 is: 453.78

Step by Step Solution

  1. Step 1: Write the proportion equation
    561.74 : 775.08 = 328.88 : x
  2. Step 2: Convert to fraction form
    561.74/775.08 = 328.88/x
  3. Step 3: Cross multiply
    561.74x = 775.08 × 328.88
  4. Step 4: Simplify right side
    561.74x = 254,908.31
  5. Step 5: Solve for x
    x = 254,908.31/561.74
  6. Step 6: Final answer
    x = 453.78

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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.