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Finding the Fourth Proportional to 718.68, 1,078.43 and 285.87

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Solution

The fourth proportional to 718.68, 1,078.43 and 285.87 is: 428.97

Step by Step Solution

  1. Step 1: Write the proportion equation
    718.68 : 1,078.43 = 285.87 : x
  2. Step 2: Convert to fraction form
    718.68/1,078.43 = 285.87/x
  3. Step 3: Cross multiply
    718.68x = 1,078.43 × 285.87
  4. Step 4: Simplify right side
    718.68x = 308,289.35
  5. Step 5: Solve for x
    x = 308,289.35/718.68
  6. Step 6: Final answer
    x = 428.97

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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.