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Finding the Fourth Proportional to 389.76, 537.88 and 215.08

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Solution

The fourth proportional to 389.76, 537.88 and 215.08 is: 296.82

Step by Step Solution

  1. Step 1: Write the proportion equation
    389.76 : 537.88 = 215.08 : x
  2. Step 2: Convert to fraction form
    389.76/537.88 = 215.08/x
  3. Step 3: Cross multiply
    389.76x = 537.88 × 215.08
  4. Step 4: Simplify right side
    389.76x = 115,687.23
  5. Step 5: Solve for x
    x = 115,687.23/389.76
  6. Step 6: Final answer
    x = 296.82

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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.