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Finding the Fourth Proportional to 278.52, 417.84 and 156.72

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Solution

The fourth proportional to 278.52, 417.84 and 156.72 is: 235.11

Step by Step Solution

  1. Step 1: Write the proportion equation
    278.52 : 417.84 = 156.72 : x
  2. Step 2: Convert to fraction form
    278.52/417.84 = 156.72/x
  3. Step 3: Cross multiply
    278.52x = 417.84 × 156.72
  4. Step 4: Simplify right side
    278.52x = 65,483.88
  5. Step 5: Solve for x
    x = 65,483.88/278.52
  6. Step 6: Final answer
    x = 235.11

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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.