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Finding the Fourth Proportional to 906.30, 1,359.60 and 386.55

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Solution

The fourth proportional to 906.30, 1,359.60 and 386.55 is: 579.89

Step by Step Solution

  1. Step 1: Write the proportion equation
    906.30 : 1,359.60 = 386.55 : x
  2. Step 2: Convert to fraction form
    906.30/1,359.60 = 386.55/x
  3. Step 3: Cross multiply
    906.30x = 1,359.60 × 386.55
  4. Step 4: Simplify right side
    906.30x = 525,553.38
  5. Step 5: Solve for x
    x = 525,553.38/906.30
  6. Step 6: Final answer
    x = 579.89

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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.