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Finding the Fourth Proportional to 313.44, 432.32 and 308.64

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Solution

The fourth proportional to 313.44, 432.32 and 308.64 is: 425.70

Step by Step Solution

  1. Step 1: Write the proportion equation
    313.44 : 432.32 = 308.64 : x
  2. Step 2: Convert to fraction form
    313.44/432.32 = 308.64/x
  3. Step 3: Cross multiply
    313.44x = 432.32 × 308.64
  4. Step 4: Simplify right side
    313.44x = 133,431.24
  5. Step 5: Solve for x
    x = 133,431.24/313.44
  6. Step 6: Final answer
    x = 425.70

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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.