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Finding the Fourth Proportional to 390.82, 586.35 and 116.92

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Solution

The fourth proportional to 390.82, 586.35 and 116.92 is: 175.41

Step by Step Solution

  1. Step 1: Write the proportion equation
    390.82 : 586.35 = 116.92 : x
  2. Step 2: Convert to fraction form
    390.82/586.35 = 116.92/x
  3. Step 3: Cross multiply
    390.82x = 586.35 × 116.92
  4. Step 4: Simplify right side
    390.82x = 68,555.46
  5. Step 5: Solve for x
    x = 68,555.46/390.82
  6. Step 6: Final answer
    x = 175.41

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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.