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Finding the Fourth Proportional to 391.37, 538.85 and 317.93

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Solution

The fourth proportional to 391.37, 538.85 and 317.93 is: 437.74

Step by Step Solution

  1. Step 1: Write the proportion equation
    391.37 : 538.85 = 317.93 : x
  2. Step 2: Convert to fraction form
    391.37/538.85 = 317.93/x
  3. Step 3: Cross multiply
    391.37x = 538.85 × 317.93
  4. Step 4: Simplify right side
    391.37x = 171,314.68
  5. Step 5: Solve for x
    x = 171,314.68/391.37
  6. Step 6: Final answer
    x = 437.74

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These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.