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Finding the Fourth Proportional to 719.56, 1,078.98 and 286.66

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Solution

The fourth proportional to 719.56, 1,078.98 and 286.66 is: 429.85

Step by Step Solution

  1. Step 1: Write the proportion equation
    719.56 : 1,078.98 = 286.66 : x
  2. Step 2: Convert to fraction form
    719.56/1,078.98 = 286.66/x
  3. Step 3: Cross multiply
    719.56x = 1,078.98 × 286.66
  4. Step 4: Simplify right side
    719.56x = 309,300.41
  5. Step 5: Solve for x
    x = 309,300.41/719.56
  6. Step 6: Final answer
    x = 429.85

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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.