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Finding the Fourth Proportional to 66,378.36, 99,551.82 and 18,992

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Solution

The fourth proportional to 66,378.36, 99,551.82 and 18,992 is: 28,483.50

Step by Step Solution

  1. Step 1: Write the proportion equation
    66,378.36 : 99,551.82 = 18,992 : x
  2. Step 2: Convert to fraction form
    66,378.36/99,551.82 = 18,992/x
  3. Step 3: Cross multiply
    66,378.36x = 99,551.82 × 18,992
  4. Step 4: Simplify right side
    66,378.36x = 1,890,688,165.44
  5. Step 5: Solve for x
    x = 1,890,688,165.44/66,378.36
  6. Step 6: Final answer
    x = 28,483.50

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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.