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Finding the Fourth Proportional to 1,405.57, 2,108.62 and 539.82

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Solution

The fourth proportional to 1,405.57, 2,108.62 and 539.82 is: 809.82

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,405.57 : 2,108.62 = 539.82 : x
  2. Step 2: Convert to fraction form
    1,405.57/2,108.62 = 539.82/x
  3. Step 3: Cross multiply
    1,405.57x = 2,108.62 × 539.82
  4. Step 4: Simplify right side
    1,405.57x = 1,138,264.71
  5. Step 5: Solve for x
    x = 1,138,264.71/1,405.57
  6. Step 6: Final answer
    x = 809.82

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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.