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Finding the Fourth Proportional to 906.37, 1,359.24 and 431.40

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Solution

The fourth proportional to 906.37, 1,359.24 and 431.40 is: 646.94

Step by Step Solution

  1. Step 1: Write the proportion equation
    906.37 : 1,359.24 = 431.40 : x
  2. Step 2: Convert to fraction form
    906.37/1,359.24 = 431.40/x
  3. Step 3: Cross multiply
    906.37x = 1,359.24 × 431.40
  4. Step 4: Simplify right side
    906.37x = 586,367.18
  5. Step 5: Solve for x
    x = 586,367.18/906.37
  6. Step 6: Final answer
    x = 646.94

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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.