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Finding the Fourth Proportional to 66,466.40, 99,699.60 and 19,719.20

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Solution

The fourth proportional to 66,466.40, 99,699.60 and 19,719.20 is: 29,578.80

Step by Step Solution

  1. Step 1: Write the proportion equation
    66,466.40 : 99,699.60 = 19,719.20 : x
  2. Step 2: Convert to fraction form
    66,466.40/99,699.60 = 19,719.20/x
  3. Step 3: Cross multiply
    66,466.40x = 99,699.60 × 19,719.20
  4. Step 4: Simplify right side
    66,466.40x = 1,965,996,352.32
  5. Step 5: Solve for x
    x = 1,965,996,352.32/66,466.40
  6. Step 6: Final answer
    x = 29,578.80

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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.