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Finding the Fourth Proportional to 561.18, 774.48 and 328.32

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Solution

The fourth proportional to 561.18, 774.48 and 328.32 is: 453.11

Step by Step Solution

  1. Step 1: Write the proportion equation
    561.18 : 774.48 = 328.32 : x
  2. Step 2: Convert to fraction form
    561.18/774.48 = 328.32/x
  3. Step 3: Cross multiply
    561.18x = 774.48 × 328.32
  4. Step 4: Simplify right side
    561.18x = 254,277.27
  5. Step 5: Solve for x
    x = 254,277.27/561.18
  6. Step 6: Final answer
    x = 453.11

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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.