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Finding the Fourth Proportional to 278.88, 417.80 and 156.77

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Solution

The fourth proportional to 278.88, 417.80 and 156.77 is: 234.85

Step by Step Solution

  1. Step 1: Write the proportion equation
    278.88 : 417.80 = 156.77 : x
  2. Step 2: Convert to fraction form
    278.88/417.80 = 156.77/x
  3. Step 3: Cross multiply
    278.88x = 417.80 × 156.77
  4. Step 4: Simplify right side
    278.88x = 65,495.63
  5. Step 5: Solve for x
    x = 65,495.63/278.88
  6. Step 6: Final answer
    x = 234.85

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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.