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Finding the Fourth Proportional to 646.55, 892.32 and 470.09

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Solution

The fourth proportional to 646.55, 892.32 and 470.09 is: 648.78

Step by Step Solution

  1. Step 1: Write the proportion equation
    646.55 : 892.32 = 470.09 : x
  2. Step 2: Convert to fraction form
    646.55/892.32 = 470.09/x
  3. Step 3: Cross multiply
    646.55x = 892.32 × 470.09
  4. Step 4: Simplify right side
    646.55x = 419,466.25
  5. Step 5: Solve for x
    x = 419,466.25/646.55
  6. Step 6: Final answer
    x = 648.78

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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.