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Finding the Fourth Proportional to 561.28, 774.48 and 340.20

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Solution

The fourth proportional to 561.28, 774.48 and 340.20 is: 469.42

Step by Step Solution

  1. Step 1: Write the proportion equation
    561.28 : 774.48 = 340.20 : x
  2. Step 2: Convert to fraction form
    561.28/774.48 = 340.20/x
  3. Step 3: Cross multiply
    561.28x = 774.48 × 340.20
  4. Step 4: Simplify right side
    561.28x = 263,478.10
  5. Step 5: Solve for x
    x = 263,478.10/561.28
  6. Step 6: Final answer
    x = 469.42

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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.