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Finding the Fourth Proportional to 66,653.60, 99,991.60 and 19,911.20

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Solution

The fourth proportional to 66,653.60, 99,991.60 and 19,911.20 is: 29,870.15

Step by Step Solution

  1. Step 1: Write the proportion equation
    66,653.60 : 99,991.60 = 19,911.20 : x
  2. Step 2: Convert to fraction form
    66,653.60/99,991.60 = 19,911.20/x
  3. Step 3: Cross multiply
    66,653.60x = 99,991.60 × 19,911.20
  4. Step 4: Simplify right side
    66,653.60x = 1,990,952,745.92
  5. Step 5: Solve for x
    x = 1,990,952,745.92/66,653.60
  6. Step 6: Final answer
    x = 29,870.15

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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.