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Finding the Fourth Proportional to 389.72, 537.78 and 215.02

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Solution

The fourth proportional to 389.72, 537.78 and 215.02 is: 296.71

Step by Step Solution

  1. Step 1: Write the proportion equation
    389.72 : 537.78 = 215.02 : x
  2. Step 2: Convert to fraction form
    389.72/537.78 = 215.02/x
  3. Step 3: Cross multiply
    389.72x = 537.78 × 215.02
  4. Step 4: Simplify right side
    389.72x = 115,633.46
  5. Step 5: Solve for x
    x = 115,633.46/389.72
  6. Step 6: Final answer
    x = 296.71

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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.