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Finding the Fourth Proportional to 534.45, 801.75 and 209.78

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Solution

The fourth proportional to 534.45, 801.75 and 209.78 is: 314.70

Step by Step Solution

  1. Step 1: Write the proportion equation
    534.45 : 801.75 = 209.78 : x
  2. Step 2: Convert to fraction form
    534.45/801.75 = 209.78/x
  3. Step 3: Cross multiply
    534.45x = 801.75 × 209.78
  4. Step 4: Simplify right side
    534.45x = 168,191.12
  5. Step 5: Solve for x
    x = 168,191.12/534.45
  6. Step 6: Final answer
    x = 314.70

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.