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Finding the Fourth Proportional to 353.84, 530.30 and 261.80

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Solution

The fourth proportional to 353.84, 530.30 and 261.80 is: 392.36

Step by Step Solution

  1. Step 1: Write the proportion equation
    353.84 : 530.30 = 261.80 : x
  2. Step 2: Convert to fraction form
    353.84/530.30 = 261.80/x
  3. Step 3: Cross multiply
    353.84x = 530.30 × 261.80
  4. Step 4: Simplify right side
    353.84x = 138,832.54
  5. Step 5: Solve for x
    x = 138,832.54/353.84
  6. Step 6: Final answer
    x = 392.36

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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.