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Finding the Fourth Proportional to 641.38, 885.12 and 361.58

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Solution

The fourth proportional to 641.38, 885.12 and 361.58 is: 498.99

Step by Step Solution

  1. Step 1: Write the proportion equation
    641.38 : 885.12 = 361.58 : x
  2. Step 2: Convert to fraction form
    641.38/885.12 = 361.58/x
  3. Step 3: Cross multiply
    641.38x = 885.12 × 361.58
  4. Step 4: Simplify right side
    641.38x = 320,041.69
  5. Step 5: Solve for x
    x = 320,041.69/641.38
  6. Step 6: Final answer
    x = 498.99

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1.5x scale

Why These Related Problems?

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