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Finding the Fourth Proportional to 646.28, 891.79 and 436.92

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Solution

The fourth proportional to 646.28, 891.79 and 436.92 is: 602.89

Step by Step Solution

  1. Step 1: Write the proportion equation
    646.28 : 891.79 = 436.92 : x
  2. Step 2: Convert to fraction form
    646.28/891.79 = 436.92/x
  3. Step 3: Cross multiply
    646.28x = 891.79 × 436.92
  4. Step 4: Simplify right side
    646.28x = 389,638.91
  5. Step 5: Solve for x
    x = 389,638.91/646.28
  6. Step 6: Final answer
    x = 602.89

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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.