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Finding the Fourth Proportional to 279.12, 417.64 and 157.48

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Solution

The fourth proportional to 279.12, 417.64 and 157.48 is: 235.63

Step by Step Solution

  1. Step 1: Write the proportion equation
    279.12 : 417.64 = 157.48 : x
  2. Step 2: Convert to fraction form
    279.12/417.64 = 157.48/x
  3. Step 3: Cross multiply
    279.12x = 417.64 × 157.48
  4. Step 4: Simplify right side
    279.12x = 65,769.95
  5. Step 5: Solve for x
    x = 65,769.95/279.12
  6. Step 6: Final answer
    x = 235.63

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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.