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Finding the Fourth Proportional to 347.25, 520.89 and 90.75

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Solution

The fourth proportional to 347.25, 520.89 and 90.75 is: 136.13

Step by Step Solution

  1. Step 1: Write the proportion equation
    347.25 : 520.89 = 90.75 : x
  2. Step 2: Convert to fraction form
    347.25/520.89 = 90.75/x
  3. Step 3: Cross multiply
    347.25x = 520.89 × 90.75
  4. Step 4: Simplify right side
    347.25x = 47,270.77
  5. Step 5: Solve for x
    x = 47,270.77/347.25
  6. Step 6: Final answer
    x = 136.13

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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.