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Finding the Fourth Proportional to 311.96, 430.26 and 307.16

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Solution

The fourth proportional to 311.96, 430.26 and 307.16 is: 423.64

Step by Step Solution

  1. Step 1: Write the proportion equation
    311.96 : 430.26 = 307.16 : x
  2. Step 2: Convert to fraction form
    311.96/430.26 = 307.16/x
  3. Step 3: Cross multiply
    311.96x = 430.26 × 307.16
  4. Step 4: Simplify right side
    311.96x = 132,158.66
  5. Step 5: Solve for x
    x = 132,158.66/311.96
  6. Step 6: Final answer
    x = 423.64

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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.