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Finding the Fourth Proportional to 646.82, 892.51 and 398.10

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Solution

The fourth proportional to 646.82, 892.51 and 398.10 is: 549.32

Step by Step Solution

  1. Step 1: Write the proportion equation
    646.82 : 892.51 = 398.10 : x
  2. Step 2: Convert to fraction form
    646.82/892.51 = 398.10/x
  3. Step 3: Cross multiply
    646.82x = 892.51 × 398.10
  4. Step 4: Simplify right side
    646.82x = 355,308.23
  5. Step 5: Solve for x
    x = 355,308.23/646.82
  6. Step 6: Final answer
    x = 549.32

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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.