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Finding the Fourth Proportional to 718.06, 1,076.81 and 285.50

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Solution

The fourth proportional to 718.06, 1,076.81 and 285.50 is: 428.14

Step by Step Solution

  1. Step 1: Write the proportion equation
    718.06 : 1,076.81 = 285.50 : x
  2. Step 2: Convert to fraction form
    718.06/1,076.81 = 285.50/x
  3. Step 3: Cross multiply
    718.06x = 1,076.81 × 285.50
  4. Step 4: Simplify right side
    718.06x = 307,429.26
  5. Step 5: Solve for x
    x = 307,429.26/718.06
  6. Step 6: Final answer
    x = 428.14

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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.