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Finding the Fourth Proportional to 320.31, 442.13 and 310.05

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Solution

The fourth proportional to 320.31, 442.13 and 310.05 is: 427.96

Step by Step Solution

  1. Step 1: Write the proportion equation
    320.31 : 442.13 = 310.05 : x
  2. Step 2: Convert to fraction form
    320.31/442.13 = 310.05/x
  3. Step 3: Cross multiply
    320.31x = 442.13 × 310.05
  4. Step 4: Simplify right side
    320.31x = 137,080.86
  5. Step 5: Solve for x
    x = 137,080.86/320.31
  6. Step 6: Final answer
    x = 427.96

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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.