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Finding the Fourth Proportional to 99,713.80, 149,643.60 and 66,422.80

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Solution

The fourth proportional to 99,713.80, 149,643.60 and 66,422.80 is: 99,682.76

Step by Step Solution

  1. Step 1: Write the proportion equation
    99,713.80 : 149,643.60 = 66,422.80 : x
  2. Step 2: Convert to fraction form
    99,713.80/149,643.60 = 66,422.80/x
  3. Step 3: Cross multiply
    99,713.80x = 149,643.60 × 66,422.80
  4. Step 4: Simplify right side
    99,713.80x = 9,939,746,914.08
  5. Step 5: Solve for x
    x = 9,939,746,914.08/99,713.80
  6. Step 6: Final answer
    x = 99,682.76

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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.