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Finding the Fourth Proportional to 646.58, 892.27 and 553.21

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Solution

The fourth proportional to 646.58, 892.27 and 553.21 is: 763.42

Step by Step Solution

  1. Step 1: Write the proportion equation
    646.58 : 892.27 = 553.21 : x
  2. Step 2: Convert to fraction form
    646.58/892.27 = 553.21/x
  3. Step 3: Cross multiply
    646.58x = 892.27 × 553.21
  4. Step 4: Simplify right side
    646.58x = 493,612.69
  5. Step 5: Solve for x
    x = 493,612.69/646.58
  6. Step 6: Final answer
    x = 763.42

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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.