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Finding the Fourth Proportional to 66,688.08, 100,024.80 and 19,930

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Solution

The fourth proportional to 66,688.08, 100,024.80 and 19,930 is: 29,892.81

Step by Step Solution

  1. Step 1: Write the proportion equation
    66,688.08 : 100,024.80 = 19,930 : x
  2. Step 2: Convert to fraction form
    66,688.08/100,024.80 = 19,930/x
  3. Step 3: Cross multiply
    66,688.08x = 100,024.80 × 19,930
  4. Step 4: Simplify right side
    66,688.08x = 1,993,494,264
  5. Step 5: Solve for x
    x = 1,993,494,264/66,688.08
  6. Step 6: Final answer
    x = 29,892.81

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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.