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Finding the Fourth Proportional to 390.37, 585.66 and 116.46

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Solution

The fourth proportional to 390.37, 585.66 and 116.46 is: 174.72

Step by Step Solution

  1. Step 1: Write the proportion equation
    390.37 : 585.66 = 116.46 : x
  2. Step 2: Convert to fraction form
    390.37/585.66 = 116.46/x
  3. Step 3: Cross multiply
    390.37x = 585.66 × 116.46
  4. Step 4: Simplify right side
    390.37x = 68,205.96
  5. Step 5: Solve for x
    x = 68,205.96/390.37
  6. Step 6: Final answer
    x = 174.72

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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.