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Finding the Fourth Proportional to 816.34, 1,223.97 and 347.57

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Solution

The fourth proportional to 816.34, 1,223.97 and 347.57 is: 521.13

Step by Step Solution

  1. Step 1: Write the proportion equation
    816.34 : 1,223.97 = 347.57 : x
  2. Step 2: Convert to fraction form
    816.34/1,223.97 = 347.57/x
  3. Step 3: Cross multiply
    816.34x = 1,223.97 × 347.57
  4. Step 4: Simplify right side
    816.34x = 425,415.25
  5. Step 5: Solve for x
    x = 425,415.25/816.34
  6. Step 6: Final answer
    x = 521.13

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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.