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Finding the Fourth Proportional to 66,428.82, 99,643.59 and 19,682.10

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Solution

The fourth proportional to 66,428.82, 99,643.59 and 19,682.10 is: 29,523.26

Step by Step Solution

  1. Step 1: Write the proportion equation
    66,428.82 : 99,643.59 = 19,682.10 : x
  2. Step 2: Convert to fraction form
    66,428.82/99,643.59 = 19,682.10/x
  3. Step 3: Cross multiply
    66,428.82x = 99,643.59 × 19,682.10
  4. Step 4: Simplify right side
    66,428.82x = 1,961,195,102.74
  5. Step 5: Solve for x
    x = 1,961,195,102.74/66,428.82
  6. Step 6: Final answer
    x = 29,523.26

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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.