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Finding the Fourth Proportional to 641.44, 885.58 and 493.78

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Solution

The fourth proportional to 641.44, 885.58 and 493.78 is: 681.72

Step by Step Solution

  1. Step 1: Write the proportion equation
    641.44 : 885.58 = 493.78 : x
  2. Step 2: Convert to fraction form
    641.44/885.58 = 493.78/x
  3. Step 3: Cross multiply
    641.44x = 885.58 × 493.78
  4. Step 4: Simplify right side
    641.44x = 437,281.69
  5. Step 5: Solve for x
    x = 437,281.69/641.44
  6. Step 6: Final answer
    x = 681.72

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Double scale
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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.