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Finding the Fourth Proportional to 278.10, 383.76 and 161.64

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Solution

The fourth proportional to 278.10, 383.76 and 161.64 is: 223.05

Step by Step Solution

  1. Step 1: Write the proportion equation
    278.10 : 383.76 = 161.64 : x
  2. Step 2: Convert to fraction form
    278.10/383.76 = 161.64/x
  3. Step 3: Cross multiply
    278.10x = 383.76 × 161.64
  4. Step 4: Simplify right side
    278.10x = 62,030.97
  5. Step 5: Solve for x
    x = 62,030.97/278.10
  6. Step 6: Final answer
    x = 223.05

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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.