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Finding the Fourth Proportional to 317.60, 438.88 and 243.84

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Solution

The fourth proportional to 317.60, 438.88 and 243.84 is: 336.95

Step by Step Solution

  1. Step 1: Write the proportion equation
    317.60 : 438.88 = 243.84 : x
  2. Step 2: Convert to fraction form
    317.60/438.88 = 243.84/x
  3. Step 3: Cross multiply
    317.60x = 438.88 × 243.84
  4. Step 4: Simplify right side
    317.60x = 107,016.50
  5. Step 5: Solve for x
    x = 107,016.50/317.60
  6. Step 6: Final answer
    x = 336.95

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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.