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Finding the Fourth Proportional to 312.13, 430.13 and 201.56

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Solution

The fourth proportional to 312.13, 430.13 and 201.56 is: 277.76

Step by Step Solution

  1. Step 1: Write the proportion equation
    312.13 : 430.13 = 201.56 : x
  2. Step 2: Convert to fraction form
    312.13/430.13 = 201.56/x
  3. Step 3: Cross multiply
    312.13x = 430.13 × 201.56
  4. Step 4: Simplify right side
    312.13x = 86,697.00
  5. Step 5: Solve for x
    x = 86,697.00/312.13
  6. Step 6: Final answer
    x = 277.76

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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.