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Finding the Fourth Proportional to 261.99, 393.03 and 99.66

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Solution

The fourth proportional to 261.99, 393.03 and 99.66 is: 149.51

Step by Step Solution

  1. Step 1: Write the proportion equation
    261.99 : 393.03 = 99.66 : x
  2. Step 2: Convert to fraction form
    261.99/393.03 = 99.66/x
  3. Step 3: Cross multiply
    261.99x = 393.03 × 99.66
  4. Step 4: Simplify right side
    261.99x = 39,169.37
  5. Step 5: Solve for x
    x = 39,169.37/261.99
  6. Step 6: Final answer
    x = 149.51

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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.