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Finding the Fourth Proportional to 431.50, 646.28 and 359.68

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Solution

The fourth proportional to 431.50, 646.28 and 359.68 is: 538.71

Step by Step Solution

  1. Step 1: Write the proportion equation
    431.50 : 646.28 = 359.68 : x
  2. Step 2: Convert to fraction form
    431.50/646.28 = 359.68/x
  3. Step 3: Cross multiply
    431.50x = 646.28 × 359.68
  4. Step 4: Simplify right side
    431.50x = 232,453.99
  5. Step 5: Solve for x
    x = 232,453.99/431.50
  6. Step 6: Final answer
    x = 538.71

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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.