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Finding the Fourth Proportional to 2,719.25, 4,079.16 and 869.70

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Solution

The fourth proportional to 2,719.25, 4,079.16 and 869.70 is: 1,304.64

Step by Step Solution

  1. Step 1: Write the proportion equation
    2,719.25 : 4,079.16 = 869.70 : x
  2. Step 2: Convert to fraction form
    2,719.25/4,079.16 = 869.70/x
  3. Step 3: Cross multiply
    2,719.25x = 4,079.16 × 869.70
  4. Step 4: Simplify right side
    2,719.25x = 3,547,645.45
  5. Step 5: Solve for x
    x = 3,547,645.45/2,719.25
  6. Step 6: Final answer
    x = 1,304.64

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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.