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Finding the Fourth Proportional to 389.91, 538.37 and 242.61

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Solution

The fourth proportional to 389.91, 538.37 and 242.61 is: 334.98

Step by Step Solution

  1. Step 1: Write the proportion equation
    389.91 : 538.37 = 242.61 : x
  2. Step 2: Convert to fraction form
    389.91/538.37 = 242.61/x
  3. Step 3: Cross multiply
    389.91x = 538.37 × 242.61
  4. Step 4: Simplify right side
    389.91x = 130,612.73
  5. Step 5: Solve for x
    x = 130,612.73/389.91
  6. Step 6: Final answer
    x = 334.98

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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.