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Finding the Fourth Proportional to 391.96, 536.65 and 390.58

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Solution

The fourth proportional to 391.96, 536.65 and 390.58 is: 534.76

Step by Step Solution

  1. Step 1: Write the proportion equation
    391.96 : 536.65 = 390.58 : x
  2. Step 2: Convert to fraction form
    391.96/536.65 = 390.58/x
  3. Step 3: Cross multiply
    391.96x = 536.65 × 390.58
  4. Step 4: Simplify right side
    391.96x = 209,604.76
  5. Step 5: Solve for x
    x = 209,604.76/391.96
  6. Step 6: Final answer
    x = 534.76

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Why These Related Problems?

These problems maintain the same ratio (1.37) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.