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Finding the Fourth Proportional to 390.92, 586.38 and 117.04

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Solution

The fourth proportional to 390.92, 586.38 and 117.04 is: 175.56

Step by Step Solution

  1. Step 1: Write the proportion equation
    390.92 : 586.38 = 117.04 : x
  2. Step 2: Convert to fraction form
    390.92/586.38 = 117.04/x
  3. Step 3: Cross multiply
    390.92x = 586.38 × 117.04
  4. Step 4: Simplify right side
    390.92x = 68,629.92
  5. Step 5: Solve for x
    x = 68,629.92/390.92
  6. Step 6: Final answer
    x = 175.56

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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.