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Finding the Fourth Proportional to 312.54, 430.74 and 256.92

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Solution

The fourth proportional to 312.54, 430.74 and 256.92 is: 354.08

Step by Step Solution

  1. Step 1: Write the proportion equation
    312.54 : 430.74 = 256.92 : x
  2. Step 2: Convert to fraction form
    312.54/430.74 = 256.92/x
  3. Step 3: Cross multiply
    312.54x = 430.74 × 256.92
  4. Step 4: Simplify right side
    312.54x = 110,665.72
  5. Step 5: Solve for x
    x = 110,665.72/312.54
  6. Step 6: Final answer
    x = 354.08

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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.