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Finding the Fourth Proportional to 202, 278.78 and 124.36

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Solution

The fourth proportional to 202, 278.78 and 124.36 is: 171.63

Step by Step Solution

  1. Step 1: Write the proportion equation
    202 : 278.78 = 124.36 : x
  2. Step 2: Convert to fraction form
    202/278.78 = 124.36/x
  3. Step 3: Cross multiply
    202x = 278.78 × 124.36
  4. Step 4: Simplify right side
    202x = 34,669.08
  5. Step 5: Solve for x
    x = 34,669.08/202
  6. Step 6: Final answer
    x = 171.63

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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.