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Finding the Fourth Proportional to 641.76, 886.05 and 393.33

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Solution

The fourth proportional to 641.76, 886.05 and 393.33 is: 543.05

Step by Step Solution

  1. Step 1: Write the proportion equation
    641.76 : 886.05 = 393.33 : x
  2. Step 2: Convert to fraction form
    641.76/886.05 = 393.33/x
  3. Step 3: Cross multiply
    641.76x = 886.05 × 393.33
  4. Step 4: Simplify right side
    641.76x = 348,510.05
  5. Step 5: Solve for x
    x = 348,510.05/641.76
  6. Step 6: Final answer
    x = 543.05

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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.