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Finding the Fourth Proportional to 517.12, 713.56 and 307.21

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Solution

The fourth proportional to 517.12, 713.56 and 307.21 is: 423.91

Step by Step Solution

  1. Step 1: Write the proportion equation
    517.12 : 713.56 = 307.21 : x
  2. Step 2: Convert to fraction form
    517.12/713.56 = 307.21/x
  3. Step 3: Cross multiply
    517.12x = 713.56 × 307.21
  4. Step 4: Simplify right side
    517.12x = 219,212.77
  5. Step 5: Solve for x
    x = 219,212.77/517.12
  6. Step 6: Final answer
    x = 423.91

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.