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Finding the Fourth Proportional to 641.42, 885.80 and 483.79

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Solution

The fourth proportional to 641.42, 885.80 and 483.79 is: 668.12

Step by Step Solution

  1. Step 1: Write the proportion equation
    641.42 : 885.80 = 483.79 : x
  2. Step 2: Convert to fraction form
    641.42/885.80 = 483.79/x
  3. Step 3: Cross multiply
    641.42x = 885.80 × 483.79
  4. Step 4: Simplify right side
    641.42x = 428,541.84
  5. Step 5: Solve for x
    x = 428,541.84/641.42
  6. Step 6: Final answer
    x = 668.12

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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.