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Finding the Fourth Proportional to 65,805, 98,714.40 and 21,435.20

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Solution

The fourth proportional to 65,805, 98,714.40 and 21,435.20 is: 32,155.05

Step by Step Solution

  1. Step 1: Write the proportion equation
    65,805 : 98,714.40 = 21,435.20 : x
  2. Step 2: Convert to fraction form
    65,805/98,714.40 = 21,435.20/x
  3. Step 3: Cross multiply
    65,805x = 98,714.40 × 21,435.20
  4. Step 4: Simplify right side
    65,805x = 2,115,962,906.88
  5. Step 5: Solve for x
    x = 2,115,962,906.88/65,805
  6. Step 6: Final answer
    x = 32,155.05

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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.