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Finding the Fourth Proportional to 641.80, 886.16 and 393.46

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Solution

The fourth proportional to 641.80, 886.16 and 393.46 is: 543.27

Step by Step Solution

  1. Step 1: Write the proportion equation
    641.80 : 886.16 = 393.46 : x
  2. Step 2: Convert to fraction form
    641.80/886.16 = 393.46/x
  3. Step 3: Cross multiply
    641.80x = 886.16 × 393.46
  4. Step 4: Simplify right side
    641.80x = 348,668.51
  5. Step 5: Solve for x
    x = 348,668.51/641.80
  6. Step 6: Final answer
    x = 543.27

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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.