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Finding the Fourth Proportional to 66,636.40, 99,971.90 and 19,889.28

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Solution

The fourth proportional to 66,636.40, 99,971.90 and 19,889.28 is: 29,839.08

Step by Step Solution

  1. Step 1: Write the proportion equation
    66,636.40 : 99,971.90 = 19,889.28 : x
  2. Step 2: Convert to fraction form
    66,636.40/99,971.90 = 19,889.28/x
  3. Step 3: Cross multiply
    66,636.40x = 99,971.90 × 19,889.28
  4. Step 4: Simplify right side
    66,636.40x = 1,988,369,111.23
  5. Step 5: Solve for x
    x = 1,988,369,111.23/66,636.40
  6. Step 6: Final answer
    x = 29,839.08

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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.