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Finding the Fourth Proportional to 646.70, 892.44 and 397.92

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Solution

The fourth proportional to 646.70, 892.44 and 397.92 is: 549.13

Step by Step Solution

  1. Step 1: Write the proportion equation
    646.70 : 892.44 = 397.92 : x
  2. Step 2: Convert to fraction form
    646.70/892.44 = 397.92/x
  3. Step 3: Cross multiply
    646.70x = 892.44 × 397.92
  4. Step 4: Simplify right side
    646.70x = 355,119.72
  5. Step 5: Solve for x
    x = 355,119.72/646.70
  6. Step 6: Final answer
    x = 549.13

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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.