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Finding the Fourth Proportional to 65,662.20, 98,493.30 and 21,290.40

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Solution

The fourth proportional to 65,662.20, 98,493.30 and 21,290.40 is: 31,935.60

Step by Step Solution

  1. Step 1: Write the proportion equation
    65,662.20 : 98,493.30 = 21,290.40 : x
  2. Step 2: Convert to fraction form
    65,662.20/98,493.30 = 21,290.40/x
  3. Step 3: Cross multiply
    65,662.20x = 98,493.30 × 21,290.40
  4. Step 4: Simplify right side
    65,662.20x = 2,096,961,754.32
  5. Step 5: Solve for x
    x = 2,096,961,754.32/65,662.20
  6. Step 6: Final answer
    x = 31,935.60

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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.