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Finding the Fourth Proportional to 390.10, 538.37 and 242.82

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Solution

The fourth proportional to 390.10, 538.37 and 242.82 is: 335.11

Step by Step Solution

  1. Step 1: Write the proportion equation
    390.10 : 538.37 = 242.82 : x
  2. Step 2: Convert to fraction form
    390.10/538.37 = 242.82/x
  3. Step 3: Cross multiply
    390.10x = 538.37 × 242.82
  4. Step 4: Simplify right side
    390.10x = 130,727.00
  5. Step 5: Solve for x
    x = 130,727.00/390.10
  6. Step 6: Final answer
    x = 335.11

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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.