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Finding the Fourth Proportional to 312, 430.58 and 172.12

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Solution

The fourth proportional to 312, 430.58 and 172.12 is: 237.54

Step by Step Solution

  1. Step 1: Write the proportion equation
    312 : 430.58 = 172.12 : x
  2. Step 2: Convert to fraction form
    312/430.58 = 172.12/x
  3. Step 3: Cross multiply
    312x = 430.58 × 172.12
  4. Step 4: Simplify right side
    312x = 74,111.43
  5. Step 5: Solve for x
    x = 74,111.43/312
  6. Step 6: Final answer
    x = 237.54

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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.