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Finding the Fourth Proportional to 638.74, 957.65 and 243.35

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Solution

The fourth proportional to 638.74, 957.65 and 243.35 is: 364.86

Step by Step Solution

  1. Step 1: Write the proportion equation
    638.74 : 957.65 = 243.35 : x
  2. Step 2: Convert to fraction form
    638.74/957.65 = 243.35/x
  3. Step 3: Cross multiply
    638.74x = 957.65 × 243.35
  4. Step 4: Simplify right side
    638.74x = 233,047.13
  5. Step 5: Solve for x
    x = 233,047.13/638.74
  6. Step 6: Final answer
    x = 364.86

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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.