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Finding the Fourth Proportional to 353.49, 530.30 and 170.78

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Solution

The fourth proportional to 353.49, 530.30 and 170.78 is: 256.20

Step by Step Solution

  1. Step 1: Write the proportion equation
    353.49 : 530.30 = 170.78 : x
  2. Step 2: Convert to fraction form
    353.49/530.30 = 170.78/x
  3. Step 3: Cross multiply
    353.49x = 530.30 × 170.78
  4. Step 4: Simplify right side
    353.49x = 90,564.63
  5. Step 5: Solve for x
    x = 90,564.63/353.49
  6. Step 6: Final answer
    x = 256.20

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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.