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Finding the Fourth Proportional to 279.60, 418.40 and 157.98

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Solution

The fourth proportional to 279.60, 418.40 and 157.98 is: 236.40

Step by Step Solution

  1. Step 1: Write the proportion equation
    279.60 : 418.40 = 157.98 : x
  2. Step 2: Convert to fraction form
    279.60/418.40 = 157.98/x
  3. Step 3: Cross multiply
    279.60x = 418.40 × 157.98
  4. Step 4: Simplify right side
    279.60x = 66,098.83
  5. Step 5: Solve for x
    x = 66,098.83/279.60
  6. Step 6: Final answer
    x = 236.40

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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.