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Finding the Fourth Proportional to 391.35, 587.01 and 117.45

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Solution

The fourth proportional to 391.35, 587.01 and 117.45 is: 176.17

Step by Step Solution

  1. Step 1: Write the proportion equation
    391.35 : 587.01 = 117.45 : x
  2. Step 2: Convert to fraction form
    391.35/587.01 = 117.45/x
  3. Step 3: Cross multiply
    391.35x = 587.01 × 117.45
  4. Step 4: Simplify right side
    391.35x = 68,944.32
  5. Step 5: Solve for x
    x = 68,944.32/391.35
  6. Step 6: Final answer
    x = 176.17

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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.