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Finding the Fourth Proportional to 313.01, 431.85 and 202.55

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Solution

The fourth proportional to 313.01, 431.85 and 202.55 is: 279.45

Step by Step Solution

  1. Step 1: Write the proportion equation
    313.01 : 431.85 = 202.55 : x
  2. Step 2: Convert to fraction form
    313.01/431.85 = 202.55/x
  3. Step 3: Cross multiply
    313.01x = 431.85 × 202.55
  4. Step 4: Simplify right side
    313.01x = 87,472.26
  5. Step 5: Solve for x
    x = 87,472.26/313.01
  6. Step 6: Final answer
    x = 279.45

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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.