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Finding the Fourth Proportional to 346.43, 520.76 and 278.71

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Solution

The fourth proportional to 346.43, 520.76 and 278.71 is: 418.96

Step by Step Solution

  1. Step 1: Write the proportion equation
    346.43 : 520.76 = 278.71 : x
  2. Step 2: Convert to fraction form
    346.43/520.76 = 278.71/x
  3. Step 3: Cross multiply
    346.43x = 520.76 × 278.71
  4. Step 4: Simplify right side
    346.43x = 145,140.41
  5. Step 5: Solve for x
    x = 145,140.41/346.43
  6. Step 6: Final answer
    x = 418.96

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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.