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Finding the Fourth Proportional to 561.19, 774.49 and 328.31

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Solution

The fourth proportional to 561.19, 774.49 and 328.31 is: 453.10

Step by Step Solution

  1. Step 1: Write the proportion equation
    561.19 : 774.49 = 328.31 : x
  2. Step 2: Convert to fraction form
    561.19/774.49 = 328.31/x
  3. Step 3: Cross multiply
    561.19x = 774.49 × 328.31
  4. Step 4: Simplify right side
    561.19x = 254,275.16
  5. Step 5: Solve for x
    x = 254,275.16/561.19
  6. Step 6: Final answer
    x = 453.10

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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.