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Finding the Fourth Proportional to 428.14, 590.64 and 317.87

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Solution

The fourth proportional to 428.14, 590.64 and 317.87 is: 438.53

Step by Step Solution

  1. Step 1: Write the proportion equation
    428.14 : 590.64 = 317.87 : x
  2. Step 2: Convert to fraction form
    428.14/590.64 = 317.87/x
  3. Step 3: Cross multiply
    428.14x = 590.64 × 317.87
  4. Step 4: Simplify right side
    428.14x = 187,749.92
  5. Step 5: Solve for x
    x = 187,749.92/428.14
  6. Step 6: Final answer
    x = 438.53

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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.