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Finding the Fourth Proportional to 344.88, 478.80 and 318.24

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Solution

The fourth proportional to 344.88, 478.80 and 318.24 is: 441.82

Step by Step Solution

  1. Step 1: Write the proportion equation
    344.88 : 478.80 = 318.24 : x
  2. Step 2: Convert to fraction form
    344.88/478.80 = 318.24/x
  3. Step 3: Cross multiply
    344.88x = 478.80 × 318.24
  4. Step 4: Simplify right side
    344.88x = 152,373.31
  5. Step 5: Solve for x
    x = 152,373.31/344.88
  6. Step 6: Final answer
    x = 441.82

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Why These Related Problems?

These problems maintain the same ratio (1.39) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.