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Finding the Fourth Proportional to 905.90, 1,359.53 and 663.05

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Solution

The fourth proportional to 905.90, 1,359.53 and 663.05 is: 995.08

Step by Step Solution

  1. Step 1: Write the proportion equation
    905.90 : 1,359.53 = 663.05 : x
  2. Step 2: Convert to fraction form
    905.90/1,359.53 = 663.05/x
  3. Step 3: Cross multiply
    905.90x = 1,359.53 × 663.05
  4. Step 4: Simplify right side
    905.90x = 901,442.67
  5. Step 5: Solve for x
    x = 901,442.67/905.90
  6. Step 6: Final answer
    x = 995.08

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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.