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Finding the Fourth Proportional to 866.69, 1,298.91 and 660.50

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Solution

The fourth proportional to 866.69, 1,298.91 and 660.50 is: 989.89

Step by Step Solution

  1. Step 1: Write the proportion equation
    866.69 : 1,298.91 = 660.50 : x
  2. Step 2: Convert to fraction form
    866.69/1,298.91 = 660.50/x
  3. Step 3: Cross multiply
    866.69x = 1,298.91 × 660.50
  4. Step 4: Simplify right side
    866.69x = 857,930.06
  5. Step 5: Solve for x
    x = 857,930.06/866.69
  6. Step 6: Final answer
    x = 989.89

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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.