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Finding the Fourth Proportional to 390.67, 537.76 and 343.89

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Solution

The fourth proportional to 390.67, 537.76 and 343.89 is: 473.37

Step by Step Solution

  1. Step 1: Write the proportion equation
    390.67 : 537.76 = 343.89 : x
  2. Step 2: Convert to fraction form
    390.67/537.76 = 343.89/x
  3. Step 3: Cross multiply
    390.67x = 537.76 × 343.89
  4. Step 4: Simplify right side
    390.67x = 184,929.43
  5. Step 5: Solve for x
    x = 184,929.43/390.67
  6. Step 6: Final answer
    x = 473.37

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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.