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Finding the Fourth Proportional to 859.25, 1,287.08 and 549.53

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Solution

The fourth proportional to 859.25, 1,287.08 and 549.53 is: 823.14

Step by Step Solution

  1. Step 1: Write the proportion equation
    859.25 : 1,287.08 = 549.53 : x
  2. Step 2: Convert to fraction form
    859.25/1,287.08 = 549.53/x
  3. Step 3: Cross multiply
    859.25x = 1,287.08 × 549.53
  4. Step 4: Simplify right side
    859.25x = 707,286.78
  5. Step 5: Solve for x
    x = 707,286.78/859.25
  6. Step 6: Final answer
    x = 823.14

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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.