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Finding the Fourth Proportional to 346.46, 478.79 and 309.55

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Solution

The fourth proportional to 346.46, 478.79 and 309.55 is: 427.78

Step by Step Solution

  1. Step 1: Write the proportion equation
    346.46 : 478.79 = 309.55 : x
  2. Step 2: Convert to fraction form
    346.46/478.79 = 309.55/x
  3. Step 3: Cross multiply
    346.46x = 478.79 × 309.55
  4. Step 4: Simplify right side
    346.46x = 148,207.86
  5. Step 5: Solve for x
    x = 148,207.86/346.46
  6. Step 6: Final answer
    x = 427.78

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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.