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Finding the Fourth Proportional to 317.77, 438.09 and 310.87

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Solution

The fourth proportional to 317.77, 438.09 and 310.87 is: 428.58

Step by Step Solution

  1. Step 1: Write the proportion equation
    317.77 : 438.09 = 310.87 : x
  2. Step 2: Convert to fraction form
    317.77/438.09 = 310.87/x
  3. Step 3: Cross multiply
    317.77x = 438.09 × 310.87
  4. Step 4: Simplify right side
    317.77x = 136,189.04
  5. Step 5: Solve for x
    x = 136,189.04/317.77
  6. Step 6: Final answer
    x = 428.58

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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.