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Finding the Fourth Proportional to 1,979.39, 2,969.64 and 868.91

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Solution

The fourth proportional to 1,979.39, 2,969.64 and 868.91 is: 1,303.61

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,979.39 : 2,969.64 = 868.91 : x
  2. Step 2: Convert to fraction form
    1,979.39/2,969.64 = 868.91/x
  3. Step 3: Cross multiply
    1,979.39x = 2,969.64 × 868.91
  4. Step 4: Simplify right side
    1,979.39x = 2,580,349.89
  5. Step 5: Solve for x
    x = 2,580,349.89/1,979.39
  6. Step 6: Final answer
    x = 1,303.61

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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.