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Finding the Fourth Proportional to 353.72, 486.90 and 312.38

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Solution

The fourth proportional to 353.72, 486.90 and 312.38 is: 429.99

Step by Step Solution

  1. Step 1: Write the proportion equation
    353.72 : 486.90 = 312.38 : x
  2. Step 2: Convert to fraction form
    353.72/486.90 = 312.38/x
  3. Step 3: Cross multiply
    353.72x = 486.90 × 312.38
  4. Step 4: Simplify right side
    353.72x = 152,097.82
  5. Step 5: Solve for x
    x = 152,097.82/353.72
  6. Step 6: Final answer
    x = 429.99

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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.