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Finding the Fourth Proportional to 66,845.98, 92,238.64 and 39,978.68

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Solution

The fourth proportional to 66,845.98, 92,238.64 and 39,978.68 is: 55,165.31

Step by Step Solution

  1. Step 1: Write the proportion equation
    66,845.98 : 92,238.64 = 39,978.68 : x
  2. Step 2: Convert to fraction form
    66,845.98/92,238.64 = 39,978.68/x
  3. Step 3: Cross multiply
    66,845.98x = 92,238.64 × 39,978.68
  4. Step 4: Simplify right side
    66,845.98x = 3,687,579,072.20
  5. Step 5: Solve for x
    x = 3,687,579,072.20/66,845.98
  6. Step 6: Final answer
    x = 55,165.31

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.