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Finding the Fourth Proportional to 390.16, 584.61 and 235.88

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Solution

The fourth proportional to 390.16, 584.61 and 235.88 is: 353.44

Step by Step Solution

  1. Step 1: Write the proportion equation
    390.16 : 584.61 = 235.88 : x
  2. Step 2: Convert to fraction form
    390.16/584.61 = 235.88/x
  3. Step 3: Cross multiply
    390.16x = 584.61 × 235.88
  4. Step 4: Simplify right side
    390.16x = 137,897.81
  5. Step 5: Solve for x
    x = 137,897.81/390.16
  6. Step 6: Final answer
    x = 353.44

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.