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Finding the Fourth Proportional to 646.71, 892.66 and 439.83

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Solution

The fourth proportional to 646.71, 892.66 and 439.83 is: 607.10

Step by Step Solution

  1. Step 1: Write the proportion equation
    646.71 : 892.66 = 439.83 : x
  2. Step 2: Convert to fraction form
    646.71/892.66 = 439.83/x
  3. Step 3: Cross multiply
    646.71x = 892.66 × 439.83
  4. Step 4: Simplify right side
    646.71x = 392,616.45
  5. Step 5: Solve for x
    x = 392,616.45/646.71
  6. Step 6: Final answer
    x = 607.10

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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.