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Finding the Fourth Proportional to 2,652.35, 3,978.86 and 803.18

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Solution

The fourth proportional to 2,652.35, 3,978.86 and 803.18 is: 1,204.88

Step by Step Solution

  1. Step 1: Write the proportion equation
    2,652.35 : 3,978.86 = 803.18 : x
  2. Step 2: Convert to fraction form
    2,652.35/3,978.86 = 803.18/x
  3. Step 3: Cross multiply
    2,652.35x = 3,978.86 × 803.18
  4. Step 4: Simplify right side
    2,652.35x = 3,195,746.71
  5. Step 5: Solve for x
    x = 3,195,746.71/2,652.35
  6. Step 6: Final answer
    x = 1,204.88

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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.