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Finding the Fourth Proportional to 389.67, 537.48 and 306.74

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Solution

The fourth proportional to 389.67, 537.48 and 306.74 is: 423.10

Step by Step Solution

  1. Step 1: Write the proportion equation
    389.67 : 537.48 = 306.74 : x
  2. Step 2: Convert to fraction form
    389.67/537.48 = 306.74/x
  3. Step 3: Cross multiply
    389.67x = 537.48 × 306.74
  4. Step 4: Simplify right side
    389.67x = 164,867.96
  5. Step 5: Solve for x
    x = 164,867.96/389.67
  6. Step 6: Final answer
    x = 423.10

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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.