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Finding the Fourth Proportional to 342.79, 514.22 and 99.31

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Solution

The fourth proportional to 342.79, 514.22 and 99.31 is: 148.98

Step by Step Solution

  1. Step 1: Write the proportion equation
    342.79 : 514.22 = 99.31 : x
  2. Step 2: Convert to fraction form
    342.79/514.22 = 99.31/x
  3. Step 3: Cross multiply
    342.79x = 514.22 × 99.31
  4. Step 4: Simplify right side
    342.79x = 51,067.19
  5. Step 5: Solve for x
    x = 51,067.19/342.79
  6. Step 6: Final answer
    x = 148.98

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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.