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Finding the Fourth Proportional to 66,426.90, 99,659.76 and 21,447.20

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Solution

The fourth proportional to 66,426.90, 99,659.76 and 21,447.20 is: 32,177.07

Step by Step Solution

  1. Step 1: Write the proportion equation
    66,426.90 : 99,659.76 = 21,447.20 : x
  2. Step 2: Convert to fraction form
    66,426.90/99,659.76 = 21,447.20/x
  3. Step 3: Cross multiply
    66,426.90x = 99,659.76 × 21,447.20
  4. Step 4: Simplify right side
    66,426.90x = 2,137,422,804.67
  5. Step 5: Solve for x
    x = 2,137,422,804.67/66,426.90
  6. Step 6: Final answer
    x = 32,177.07

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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.