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Finding the Fourth Proportional to 66,419.40, 99,616.80 and 19,661.16

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Solution

The fourth proportional to 66,419.40, 99,616.80 and 19,661.16 is: 29,488.10

Step by Step Solution

  1. Step 1: Write the proportion equation
    66,419.40 : 99,616.80 = 19,661.16 : x
  2. Step 2: Convert to fraction form
    66,419.40/99,616.80 = 19,661.16/x
  3. Step 3: Cross multiply
    66,419.40x = 99,616.80 × 19,661.16
  4. Step 4: Simplify right side
    66,419.40x = 1,958,581,843.49
  5. Step 5: Solve for x
    x = 1,958,581,843.49/66,419.40
  6. Step 6: Final answer
    x = 29,488.10

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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.