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Finding the Fourth Proportional to 431.16, 646.78 and 200.10

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Solution

The fourth proportional to 431.16, 646.78 and 200.10 is: 300.17

Step by Step Solution

  1. Step 1: Write the proportion equation
    431.16 : 646.78 = 200.10 : x
  2. Step 2: Convert to fraction form
    431.16/646.78 = 200.10/x
  3. Step 3: Cross multiply
    431.16x = 646.78 × 200.10
  4. Step 4: Simplify right side
    431.16x = 129,420.68
  5. Step 5: Solve for x
    x = 129,420.68/431.16
  6. Step 6: Final answer
    x = 300.17

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.