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Finding the Fourth Proportional to 885.68, 1,330.43 and 539.21

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Solution

The fourth proportional to 885.68, 1,330.43 and 539.21 is: 809.97

Step by Step Solution

  1. Step 1: Write the proportion equation
    885.68 : 1,330.43 = 539.21 : x
  2. Step 2: Convert to fraction form
    885.68/1,330.43 = 539.21/x
  3. Step 3: Cross multiply
    885.68x = 1,330.43 × 539.21
  4. Step 4: Simplify right side
    885.68x = 717,374.31
  5. Step 5: Solve for x
    x = 717,374.31/885.68
  6. Step 6: Final answer
    x = 809.97

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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.