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Finding the Fourth Proportional to 278.57, 384.48 and 231.89

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Solution

The fourth proportional to 278.57, 384.48 and 231.89 is: 320.05

Step by Step Solution

  1. Step 1: Write the proportion equation
    278.57 : 384.48 = 231.89 : x
  2. Step 2: Convert to fraction form
    278.57/384.48 = 231.89/x
  3. Step 3: Cross multiply
    278.57x = 384.48 × 231.89
  4. Step 4: Simplify right side
    278.57x = 89,157.07
  5. Step 5: Solve for x
    x = 89,157.07/278.57
  6. Step 6: Final answer
    x = 320.05

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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.