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Finding the Fourth Proportional to 739.62, 1,109.05 and 520.31

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Solution

The fourth proportional to 739.62, 1,109.05 and 520.31 is: 780.20

Step by Step Solution

  1. Step 1: Write the proportion equation
    739.62 : 1,109.05 = 520.31 : x
  2. Step 2: Convert to fraction form
    739.62/1,109.05 = 520.31/x
  3. Step 3: Cross multiply
    739.62x = 1,109.05 × 520.31
  4. Step 4: Simplify right side
    739.62x = 577,051.28
  5. Step 5: Solve for x
    x = 577,051.28/739.62
  6. Step 6: Final answer
    x = 780.20

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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.