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Finding the Fourth Proportional to 346.48, 477.90 and 311.45

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Solution

The fourth proportional to 346.48, 477.90 and 311.45 is: 429.58

Step by Step Solution

  1. Step 1: Write the proportion equation
    346.48 : 477.90 = 311.45 : x
  2. Step 2: Convert to fraction form
    346.48/477.90 = 311.45/x
  3. Step 3: Cross multiply
    346.48x = 477.90 × 311.45
  4. Step 4: Simplify right side
    346.48x = 148,839.57
  5. Step 5: Solve for x
    x = 148,839.57/346.48
  6. Step 6: Final answer
    x = 429.58

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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.