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Finding the Fourth Proportional to 389.49, 537.43 and 315.68

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Solution

The fourth proportional to 389.49, 537.43 and 315.68 is: 435.58

Step by Step Solution

  1. Step 1: Write the proportion equation
    389.49 : 537.43 = 315.68 : x
  2. Step 2: Convert to fraction form
    389.49/537.43 = 315.68/x
  3. Step 3: Cross multiply
    389.49x = 537.43 × 315.68
  4. Step 4: Simplify right side
    389.49x = 169,654.32
  5. Step 5: Solve for x
    x = 169,654.32/389.49
  6. Step 6: Final answer
    x = 435.58

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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.