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Finding the Fourth Proportional to 391.36, 586.90 and 117.36

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Solution

The fourth proportional to 391.36, 586.90 and 117.36 is: 176.00

Step by Step Solution

  1. Step 1: Write the proportion equation
    391.36 : 586.90 = 117.36 : x
  2. Step 2: Convert to fraction form
    391.36/586.90 = 117.36/x
  3. Step 3: Cross multiply
    391.36x = 586.90 × 117.36
  4. Step 4: Simplify right side
    391.36x = 68,879.64
  5. Step 5: Solve for x
    x = 68,879.64/391.36
  6. Step 6: Final answer
    x = 176.00

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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.