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Finding the Fourth Proportional to 390.46, 538.74 and 235.18

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Solution

The fourth proportional to 390.46, 538.74 and 235.18 is: 324.49

Step by Step Solution

  1. Step 1: Write the proportion equation
    390.46 : 538.74 = 235.18 : x
  2. Step 2: Convert to fraction form
    390.46/538.74 = 235.18/x
  3. Step 3: Cross multiply
    390.46x = 538.74 × 235.18
  4. Step 4: Simplify right side
    390.46x = 126,700.87
  5. Step 5: Solve for x
    x = 126,700.87/390.46
  6. Step 6: Final answer
    x = 324.49

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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.