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Finding the Fourth Proportional to 438.78, 657.05 and 253.19

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Solution

The fourth proportional to 438.78, 657.05 and 253.19 is: 379.14

Step by Step Solution

  1. Step 1: Write the proportion equation
    438.78 : 657.05 = 253.19 : x
  2. Step 2: Convert to fraction form
    438.78/657.05 = 253.19/x
  3. Step 3: Cross multiply
    438.78x = 657.05 × 253.19
  4. Step 4: Simplify right side
    438.78x = 166,358.49
  5. Step 5: Solve for x
    x = 166,358.49/438.78
  6. Step 6: Final answer
    x = 379.14

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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.