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Finding the Fourth Proportional to 1,124.21, 1,686.24 and 539.65

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Solution

The fourth proportional to 1,124.21, 1,686.24 and 539.65 is: 809.43

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,124.21 : 1,686.24 = 539.65 : x
  2. Step 2: Convert to fraction form
    1,124.21/1,686.24 = 539.65/x
  3. Step 3: Cross multiply
    1,124.21x = 1,686.24 × 539.65
  4. Step 4: Simplify right side
    1,124.21x = 909,970.98
  5. Step 5: Solve for x
    x = 909,970.98/1,124.21
  6. Step 6: Final answer
    x = 809.43

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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.