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Finding the Fourth Proportional to 2,719, 4,078.96 and 870.16

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Solution

The fourth proportional to 2,719, 4,078.96 and 870.16 is: 1,305.39

Step by Step Solution

  1. Step 1: Write the proportion equation
    2,719 : 4,078.96 = 870.16 : x
  2. Step 2: Convert to fraction form
    2,719/4,078.96 = 870.16/x
  3. Step 3: Cross multiply
    2,719x = 4,078.96 × 870.16
  4. Step 4: Simplify right side
    2,719x = 3,549,347.83
  5. Step 5: Solve for x
    x = 3,549,347.83/2,719
  6. Step 6: Final answer
    x = 1,305.39

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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.