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Finding the Fourth Proportional to 315.68, 473.56 and 142.40

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Solution

The fourth proportional to 315.68, 473.56 and 142.40 is: 213.62

Step by Step Solution

  1. Step 1: Write the proportion equation
    315.68 : 473.56 = 142.40 : x
  2. Step 2: Convert to fraction form
    315.68/473.56 = 142.40/x
  3. Step 3: Cross multiply
    315.68x = 473.56 × 142.40
  4. Step 4: Simplify right side
    315.68x = 67,434.94
  5. Step 5: Solve for x
    x = 67,434.94/315.68
  6. Step 6: Final answer
    x = 213.62

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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.