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Finding the Fourth Proportional to 66,466.72, 99,700.70 and 19,719.60

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Solution

The fourth proportional to 66,466.72, 99,700.70 and 19,719.60 is: 29,579.58

Step by Step Solution

  1. Step 1: Write the proportion equation
    66,466.72 : 99,700.70 = 19,719.60 : x
  2. Step 2: Convert to fraction form
    66,466.72/99,700.70 = 19,719.60/x
  3. Step 3: Cross multiply
    66,466.72x = 99,700.70 × 19,719.60
  4. Step 4: Simplify right side
    66,466.72x = 1,966,057,923.72
  5. Step 5: Solve for x
    x = 1,966,057,923.72/66,466.72
  6. Step 6: Final answer
    x = 29,579.58

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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.