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Finding the Fourth Proportional to 316.30, 474.43 and 142.86

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Solution

The fourth proportional to 316.30, 474.43 and 142.86 is: 214.28

Step by Step Solution

  1. Step 1: Write the proportion equation
    316.30 : 474.43 = 142.86 : x
  2. Step 2: Convert to fraction form
    316.30/474.43 = 142.86/x
  3. Step 3: Cross multiply
    316.30x = 474.43 × 142.86
  4. Step 4: Simplify right side
    316.30x = 67,777.07
  5. Step 5: Solve for x
    x = 67,777.07/316.30
  6. Step 6: Final answer
    x = 214.28

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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.