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Finding the Fourth Proportional to 478.19, 660.04 and 312.43

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Solution

The fourth proportional to 478.19, 660.04 and 312.43 is: 431.24

Step by Step Solution

  1. Step 1: Write the proportion equation
    478.19 : 660.04 = 312.43 : x
  2. Step 2: Convert to fraction form
    478.19/660.04 = 312.43/x
  3. Step 3: Cross multiply
    478.19x = 660.04 × 312.43
  4. Step 4: Simplify right side
    478.19x = 206,215.67
  5. Step 5: Solve for x
    x = 206,215.67/478.19
  6. Step 6: Final answer
    x = 431.24

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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.