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Finding the Fourth Proportional to 1,405.42, 2,108.24 and 539.73

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Solution

The fourth proportional to 1,405.42, 2,108.24 and 539.73 is: 809.64

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,405.42 : 2,108.24 = 539.73 : x
  2. Step 2: Convert to fraction form
    1,405.42/2,108.24 = 539.73/x
  3. Step 3: Cross multiply
    1,405.42x = 2,108.24 × 539.73
  4. Step 4: Simplify right side
    1,405.42x = 1,137,886.90
  5. Step 5: Solve for x
    x = 1,137,886.90/1,405.42
  6. Step 6: Final answer
    x = 809.64

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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.