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Finding the Fourth Proportional to 431.13, 646.18 and 199.53

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Solution

The fourth proportional to 431.13, 646.18 and 199.53 is: 299.05

Step by Step Solution

  1. Step 1: Write the proportion equation
    431.13 : 646.18 = 199.53 : x
  2. Step 2: Convert to fraction form
    431.13/646.18 = 199.53/x
  3. Step 3: Cross multiply
    431.13x = 646.18 × 199.53
  4. Step 4: Simplify right side
    431.13x = 128,929.52
  5. Step 5: Solve for x
    x = 128,929.52/431.13
  6. Step 6: Final answer
    x = 299.05

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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.