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Finding the Fourth Proportional to 317.02, 438.72 and 311.62

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Solution

The fourth proportional to 317.02, 438.72 and 311.62 is: 431.25

Step by Step Solution

  1. Step 1: Write the proportion equation
    317.02 : 438.72 = 311.62 : x
  2. Step 2: Convert to fraction form
    317.02/438.72 = 311.62/x
  3. Step 3: Cross multiply
    317.02x = 438.72 × 311.62
  4. Step 4: Simplify right side
    317.02x = 136,713.93
  5. Step 5: Solve for x
    x = 136,713.93/317.02
  6. Step 6: Final answer
    x = 431.25

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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.