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Finding the Fourth Proportional to 646.55, 892.37 and 398.07

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Solution

The fourth proportional to 646.55, 892.37 and 398.07 is: 549.42

Step by Step Solution

  1. Step 1: Write the proportion equation
    646.55 : 892.37 = 398.07 : x
  2. Step 2: Convert to fraction form
    646.55/892.37 = 398.07/x
  3. Step 3: Cross multiply
    646.55x = 892.37 × 398.07
  4. Step 4: Simplify right side
    646.55x = 355,223.74
  5. Step 5: Solve for x
    x = 355,223.74/646.55
  6. Step 6: Final answer
    x = 549.42

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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.