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Finding the Fourth Proportional to 315.39, 473.09 and 142.02

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Solution

The fourth proportional to 315.39, 473.09 and 142.02 is: 213.03

Step by Step Solution

  1. Step 1: Write the proportion equation
    315.39 : 473.09 = 142.02 : x
  2. Step 2: Convert to fraction form
    315.39/473.09 = 142.02/x
  3. Step 3: Cross multiply
    315.39x = 473.09 × 142.02
  4. Step 4: Simplify right side
    315.39x = 67,187.53
  5. Step 5: Solve for x
    x = 67,187.53/315.39
  6. Step 6: Final answer
    x = 213.03

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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.