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Finding the Fourth Proportional to 646.13, 891.66 and 351.40

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Solution

The fourth proportional to 646.13, 891.66 and 351.40 is: 484.92

Step by Step Solution

  1. Step 1: Write the proportion equation
    646.13 : 891.66 = 351.40 : x
  2. Step 2: Convert to fraction form
    646.13/891.66 = 351.40/x
  3. Step 3: Cross multiply
    646.13x = 891.66 × 351.40
  4. Step 4: Simplify right side
    646.13x = 313,325.78
  5. Step 5: Solve for x
    x = 313,325.78/646.13
  6. Step 6: Final answer
    x = 484.92

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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.