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Finding the Fourth Proportional to 278.48, 417.71 and 156.74

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Solution

The fourth proportional to 278.48, 417.71 and 156.74 is: 235.10

Step by Step Solution

  1. Step 1: Write the proportion equation
    278.48 : 417.71 = 156.74 : x
  2. Step 2: Convert to fraction form
    278.48/417.71 = 156.74/x
  3. Step 3: Cross multiply
    278.48x = 417.71 × 156.74
  4. Step 4: Simplify right side
    278.48x = 65,470.17
  5. Step 5: Solve for x
    x = 65,470.17/278.48
  6. Step 6: Final answer
    x = 235.10

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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.