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Finding the Fourth Proportional to 390.48, 585.69 and 116.55

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Solution

The fourth proportional to 390.48, 585.69 and 116.55 is: 174.82

Step by Step Solution

  1. Step 1: Write the proportion equation
    390.48 : 585.69 = 116.55 : x
  2. Step 2: Convert to fraction form
    390.48/585.69 = 116.55/x
  3. Step 3: Cross multiply
    390.48x = 585.69 × 116.55
  4. Step 4: Simplify right side
    390.48x = 68,262.17
  5. Step 5: Solve for x
    x = 68,262.17/390.48
  6. Step 6: Final answer
    x = 174.82

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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.