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Finding the Fourth Proportional to 719.60, 1,078.76 and 286.64

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Solution

The fourth proportional to 719.60, 1,078.76 and 286.64 is: 429.71

Step by Step Solution

  1. Step 1: Write the proportion equation
    719.60 : 1,078.76 = 286.64 : x
  2. Step 2: Convert to fraction form
    719.60/1,078.76 = 286.64/x
  3. Step 3: Cross multiply
    719.60x = 1,078.76 × 286.64
  4. Step 4: Simplify right side
    719.60x = 309,215.77
  5. Step 5: Solve for x
    x = 309,215.77/719.60
  6. Step 6: Final answer
    x = 429.71

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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.