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Finding the Fourth Proportional to 320.47, 442.29 and 306.62

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Solution

The fourth proportional to 320.47, 442.29 and 306.62 is: 423.18

Step by Step Solution

  1. Step 1: Write the proportion equation
    320.47 : 442.29 = 306.62 : x
  2. Step 2: Convert to fraction form
    320.47/442.29 = 306.62/x
  3. Step 3: Cross multiply
    320.47x = 442.29 × 306.62
  4. Step 4: Simplify right side
    320.47x = 135,614.96
  5. Step 5: Solve for x
    x = 135,614.96/320.47
  6. Step 6: Final answer
    x = 423.18

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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.