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Finding the Fourth Proportional to 312.72, 469.55 and 245.08

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Solution

The fourth proportional to 312.72, 469.55 and 245.08 is: 367.99

Step by Step Solution

  1. Step 1: Write the proportion equation
    312.72 : 469.55 = 245.08 : x
  2. Step 2: Convert to fraction form
    312.72/469.55 = 245.08/x
  3. Step 3: Cross multiply
    312.72x = 469.55 × 245.08
  4. Step 4: Simplify right side
    312.72x = 115,077.31
  5. Step 5: Solve for x
    x = 115,077.31/312.72
  6. Step 6: Final answer
    x = 367.99

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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.