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Finding the Fourth Proportional to 906.89, 1,359.27 and 386.74

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Solution

The fourth proportional to 906.89, 1,359.27 and 386.74 is: 579.66

Step by Step Solution

  1. Step 1: Write the proportion equation
    906.89 : 1,359.27 = 386.74 : x
  2. Step 2: Convert to fraction form
    906.89/1,359.27 = 386.74/x
  3. Step 3: Cross multiply
    906.89x = 1,359.27 × 386.74
  4. Step 4: Simplify right side
    906.89x = 525,684.08
  5. Step 5: Solve for x
    x = 525,684.08/906.89
  6. Step 6: Final answer
    x = 579.66

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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.