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Finding the Fourth Proportional to 278.57, 384.41 and 243.74

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Solution

The fourth proportional to 278.57, 384.41 and 243.74 is: 336.35

Step by Step Solution

  1. Step 1: Write the proportion equation
    278.57 : 384.41 = 243.74 : x
  2. Step 2: Convert to fraction form
    278.57/384.41 = 243.74/x
  3. Step 3: Cross multiply
    278.57x = 384.41 × 243.74
  4. Step 4: Simplify right side
    278.57x = 93,697.66
  5. Step 5: Solve for x
    x = 93,697.66/278.57
  6. Step 6: Final answer
    x = 336.35

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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.