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Finding the Fourth Proportional to 561.66, 775.01 and 328.74

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Solution

The fourth proportional to 561.66, 775.01 and 328.74 is: 453.61

Step by Step Solution

  1. Step 1: Write the proportion equation
    561.66 : 775.01 = 328.74 : x
  2. Step 2: Convert to fraction form
    561.66/775.01 = 328.74/x
  3. Step 3: Cross multiply
    561.66x = 775.01 × 328.74
  4. Step 4: Simplify right side
    561.66x = 254,776.79
  5. Step 5: Solve for x
    x = 254,776.79/561.66
  6. Step 6: Final answer
    x = 453.61

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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.