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Finding the Fourth Proportional to 467.68, 645.20 and 312.48

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Solution

The fourth proportional to 467.68, 645.20 and 312.48 is: 431.09

Step by Step Solution

  1. Step 1: Write the proportion equation
    467.68 : 645.20 = 312.48 : x
  2. Step 2: Convert to fraction form
    467.68/645.20 = 312.48/x
  3. Step 3: Cross multiply
    467.68x = 645.20 × 312.48
  4. Step 4: Simplify right side
    467.68x = 201,612.10
  5. Step 5: Solve for x
    x = 201,612.10/467.68
  6. Step 6: Final answer
    x = 431.09

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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.