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Finding the Fourth Proportional to 718.23, 1,077.75 and 285.42

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Solution

The fourth proportional to 718.23, 1,077.75 and 285.42 is: 428.29

Step by Step Solution

  1. Step 1: Write the proportion equation
    718.23 : 1,077.75 = 285.42 : x
  2. Step 2: Convert to fraction form
    718.23/1,077.75 = 285.42/x
  3. Step 3: Cross multiply
    718.23x = 1,077.75 × 285.42
  4. Step 4: Simplify right side
    718.23x = 307,611.41
  5. Step 5: Solve for x
    x = 307,611.41/718.23
  6. Step 6: Final answer
    x = 428.29

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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.