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Finding the Fourth Proportional to 312.29, 430.98 and 172.42

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Solution

The fourth proportional to 312.29, 430.98 and 172.42 is: 237.95

Step by Step Solution

  1. Step 1: Write the proportion equation
    312.29 : 430.98 = 172.42 : x
  2. Step 2: Convert to fraction form
    312.29/430.98 = 172.42/x
  3. Step 3: Cross multiply
    312.29x = 430.98 × 172.42
  4. Step 4: Simplify right side
    312.29x = 74,308.49
  5. Step 5: Solve for x
    x = 74,308.49/312.29
  6. Step 6: Final answer
    x = 237.95

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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.