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Finding the Fourth Proportional to 1,405.63, 2,108.72 and 539.88

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Solution

The fourth proportional to 1,405.63, 2,108.72 and 539.88 is: 809.93

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,405.63 : 2,108.72 = 539.88 : x
  2. Step 2: Convert to fraction form
    1,405.63/2,108.72 = 539.88/x
  3. Step 3: Cross multiply
    1,405.63x = 2,108.72 × 539.88
  4. Step 4: Simplify right side
    1,405.63x = 1,138,455.75
  5. Step 5: Solve for x
    x = 1,138,455.75/1,405.63
  6. Step 6: Final answer
    x = 809.93

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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.