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Finding the Fourth Proportional to 278.71, 417.91 and 156.94

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Solution

The fourth proportional to 278.71, 417.91 and 156.94 is: 235.32

Step by Step Solution

  1. Step 1: Write the proportion equation
    278.71 : 417.91 = 156.94 : x
  2. Step 2: Convert to fraction form
    278.71/417.91 = 156.94/x
  3. Step 3: Cross multiply
    278.71x = 417.91 × 156.94
  4. Step 4: Simplify right side
    278.71x = 65,586.80
  5. Step 5: Solve for x
    x = 65,586.80/278.71
  6. Step 6: Final answer
    x = 235.32

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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.