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Finding the Fourth Proportional to 66,445.60, 99,687.60 and 19,699.60

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Solution

The fourth proportional to 66,445.60, 99,687.60 and 19,699.60 is: 29,555.09

Step by Step Solution

  1. Step 1: Write the proportion equation
    66,445.60 : 99,687.60 = 19,699.60 : x
  2. Step 2: Convert to fraction form
    66,445.60/99,687.60 = 19,699.60/x
  3. Step 3: Cross multiply
    66,445.60x = 99,687.60 × 19,699.60
  4. Step 4: Simplify right side
    66,445.60x = 1,963,805,844.96
  5. Step 5: Solve for x
    x = 1,963,805,844.96/66,445.60
  6. Step 6: Final answer
    x = 29,555.09

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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.