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Finding the Fourth Proportional to 347.72, 521.69 and 209.06

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Solution

The fourth proportional to 347.72, 521.69 and 209.06 is: 313.65

Step by Step Solution

  1. Step 1: Write the proportion equation
    347.72 : 521.69 = 209.06 : x
  2. Step 2: Convert to fraction form
    347.72/521.69 = 209.06/x
  3. Step 3: Cross multiply
    347.72x = 521.69 × 209.06
  4. Step 4: Simplify right side
    347.72x = 109,064.38
  5. Step 5: Solve for x
    x = 109,064.38/347.72
  6. Step 6: Final answer
    x = 313.65

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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.