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Finding the Fourth Proportional to 278.55, 417.82 and 73.12

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Solution

The fourth proportional to 278.55, 417.82 and 73.12 is: 109.68

Step by Step Solution

  1. Step 1: Write the proportion equation
    278.55 : 417.82 = 73.12 : x
  2. Step 2: Convert to fraction form
    278.55/417.82 = 73.12/x
  3. Step 3: Cross multiply
    278.55x = 417.82 × 73.12
  4. Step 4: Simplify right side
    278.55x = 30,551.00
  5. Step 5: Solve for x
    x = 30,551.00/278.55
  6. Step 6: Final answer
    x = 109.68

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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.