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Finding the Fourth Proportional to 316.02, 474.09 and 99.66

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Solution

The fourth proportional to 316.02, 474.09 and 99.66 is: 149.51

Step by Step Solution

  1. Step 1: Write the proportion equation
    316.02 : 474.09 = 99.66 : x
  2. Step 2: Convert to fraction form
    316.02/474.09 = 99.66/x
  3. Step 3: Cross multiply
    316.02x = 474.09 × 99.66
  4. Step 4: Simplify right side
    316.02x = 47,247.81
  5. Step 5: Solve for x
    x = 47,247.81/316.02
  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.