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Finding the Fourth Proportional to 278.60, 417.71 and 124.40

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Solution

The fourth proportional to 278.60, 417.71 and 124.40 is: 186.51

Step by Step Solution

  1. Step 1: Write the proportion equation
    278.60 : 417.71 = 124.40 : x
  2. Step 2: Convert to fraction form
    278.60/417.71 = 124.40/x
  3. Step 3: Cross multiply
    278.60x = 417.71 × 124.40
  4. Step 4: Simplify right side
    278.60x = 51,960.41
  5. Step 5: Solve for x
    x = 51,960.41/278.60
  6. Step 6: Final answer
    x = 186.51

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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.