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Finding the Fourth Proportional to 2,714.60, 4,071.90 and 865.72

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Solution

The fourth proportional to 2,714.60, 4,071.90 and 865.72 is: 1,298.57

Step by Step Solution

  1. Step 1: Write the proportion equation
    2,714.60 : 4,071.90 = 865.72 : x
  2. Step 2: Convert to fraction form
    2,714.60/4,071.90 = 865.72/x
  3. Step 3: Cross multiply
    2,714.60x = 4,071.90 × 865.72
  4. Step 4: Simplify right side
    2,714.60x = 3,525,100.58
  5. Step 5: Solve for x
    x = 3,525,100.58/2,714.60
  6. Step 6: Final answer
    x = 1,298.57

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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.