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Finding the Fourth Proportional to 2,165.19, 3,245.96 and 865.95

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Solution

The fourth proportional to 2,165.19, 3,245.96 and 865.95 is: 1,298.19

Step by Step Solution

  1. Step 1: Write the proportion equation
    2,165.19 : 3,245.96 = 865.95 : x
  2. Step 2: Convert to fraction form
    2,165.19/3,245.96 = 865.95/x
  3. Step 3: Cross multiply
    2,165.19x = 3,245.96 × 865.95
  4. Step 4: Simplify right side
    2,165.19x = 2,810,818.50
  5. Step 5: Solve for x
    x = 2,810,818.50/2,165.19
  6. Step 6: Final answer
    x = 1,298.19

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1.5x scale

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.