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Finding the Fourth Proportional to 402.20, 554.72 and 340.20

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Solution

The fourth proportional to 402.20, 554.72 and 340.20 is: 469.21

Step by Step Solution

  1. Step 1: Write the proportion equation
    402.20 : 554.72 = 340.20 : x
  2. Step 2: Convert to fraction form
    402.20/554.72 = 340.20/x
  3. Step 3: Cross multiply
    402.20x = 554.72 × 340.20
  4. Step 4: Simplify right side
    402.20x = 188,715.74
  5. Step 5: Solve for x
    x = 188,715.74/402.20
  6. Step 6: Final answer
    x = 469.21

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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.