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Finding the Fourth Proportional to 66,406.40, 99,624.18 and 19,662.92

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Solution

The fourth proportional to 66,406.40, 99,624.18 and 19,662.92 is: 29,498.69

Step by Step Solution

  1. Step 1: Write the proportion equation
    66,406.40 : 99,624.18 = 19,662.92 : x
  2. Step 2: Convert to fraction form
    66,406.40/99,624.18 = 19,662.92/x
  3. Step 3: Cross multiply
    66,406.40x = 99,624.18 × 19,662.92
  4. Step 4: Simplify right side
    66,406.40x = 1,958,901,783.28
  5. Step 5: Solve for x
    x = 1,958,901,783.28/66,406.40
  6. Step 6: Final answer
    x = 29,498.69

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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.