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Finding the Fourth Proportional to 646.40, 892.65 and 469.62

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Solution

The fourth proportional to 646.40, 892.65 and 469.62 is: 648.53

Step by Step Solution

  1. Step 1: Write the proportion equation
    646.40 : 892.65 = 469.62 : x
  2. Step 2: Convert to fraction form
    646.40/892.65 = 469.62/x
  3. Step 3: Cross multiply
    646.40x = 892.65 × 469.62
  4. Step 4: Simplify right side
    646.40x = 419,206.29
  5. Step 5: Solve for x
    x = 419,206.29/646.40
  6. Step 6: Final answer
    x = 648.53

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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.