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Finding the Fourth Proportional to 312.77, 431.61 and 202.31

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Solution

The fourth proportional to 312.77, 431.61 and 202.31 is: 279.18

Step by Step Solution

  1. Step 1: Write the proportion equation
    312.77 : 431.61 = 202.31 : x
  2. Step 2: Convert to fraction form
    312.77/431.61 = 202.31/x
  3. Step 3: Cross multiply
    312.77x = 431.61 × 202.31
  4. Step 4: Simplify right side
    312.77x = 87,319.02
  5. Step 5: Solve for x
    x = 87,319.02/312.77
  6. Step 6: Final answer
    x = 279.18

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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.