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Finding the Fourth Proportional to 517.70, 714.12 and 321.07

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Solution

The fourth proportional to 517.70, 714.12 and 321.07 is: 442.89

Step by Step Solution

  1. Step 1: Write the proportion equation
    517.70 : 714.12 = 321.07 : x
  2. Step 2: Convert to fraction form
    517.70/714.12 = 321.07/x
  3. Step 3: Cross multiply
    517.70x = 714.12 × 321.07
  4. Step 4: Simplify right side
    517.70x = 229,282.51
  5. Step 5: Solve for x
    x = 229,282.51/517.70
  6. Step 6: Final answer
    x = 442.89

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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.