Home / 278.20-417.69-141.35

Finding the Fourth Proportional to 278.20, 417.69 and 141.35

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Solution

The fourth proportional to 278.20, 417.69 and 141.35 is: 212.21

Step by Step Solution

  1. Step 1: Write the proportion equation
    278.20 : 417.69 = 141.35 : x
  2. Step 2: Convert to fraction form
    278.20/417.69 = 141.35/x
  3. Step 3: Cross multiply
    278.20x = 417.69 × 141.35
  4. Step 4: Simplify right side
    278.20x = 59,038.39
  5. Step 5: Solve for x
    x = 59,038.39/278.20
  6. Step 6: Final answer
    x = 212.21

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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.