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Finding the Fourth Proportional to 312.59, 431.35 and 172.71

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Solution

The fourth proportional to 312.59, 431.35 and 172.71 is: 238.33

Step by Step Solution

  1. Step 1: Write the proportion equation
    312.59 : 431.35 = 172.71 : x
  2. Step 2: Convert to fraction form
    312.59/431.35 = 172.71/x
  3. Step 3: Cross multiply
    312.59x = 431.35 × 172.71
  4. Step 4: Simplify right side
    312.59x = 74,498.46
  5. Step 5: Solve for x
    x = 74,498.46/312.59
  6. Step 6: Final answer
    x = 238.33

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.