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Finding the Fourth Proportional to 641.61, 885.51 and 445.05

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Solution

The fourth proportional to 641.61, 885.51 and 445.05 is: 614.23

Step by Step Solution

  1. Step 1: Write the proportion equation
    641.61 : 885.51 = 445.05 : x
  2. Step 2: Convert to fraction form
    641.61/885.51 = 445.05/x
  3. Step 3: Cross multiply
    641.61x = 885.51 × 445.05
  4. Step 4: Simplify right side
    641.61x = 394,096.23
  5. Step 5: Solve for x
    x = 394,096.23/641.61
  6. Step 6: Final answer
    x = 614.23

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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.