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Finding the Fourth Proportional to 561.90, 775.11 and 328.98

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Solution

The fourth proportional to 561.90, 775.11 and 328.98 is: 453.81

Step by Step Solution

  1. Step 1: Write the proportion equation
    561.90 : 775.11 = 328.98 : x
  2. Step 2: Convert to fraction form
    561.90/775.11 = 328.98/x
  3. Step 3: Cross multiply
    561.90x = 775.11 × 328.98
  4. Step 4: Simplify right side
    561.90x = 254,995.69
  5. Step 5: Solve for x
    x = 254,995.69/561.90
  6. Step 6: Final answer
    x = 453.81

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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.