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Finding the Fourth Proportional to 66,512.88, 91,830.96 and 51,379.20

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Solution

The fourth proportional to 66,512.88, 91,830.96 and 51,379.20 is: 70,936.66

Step by Step Solution

  1. Step 1: Write the proportion equation
    66,512.88 : 91,830.96 = 51,379.20 : x
  2. Step 2: Convert to fraction form
    66,512.88/91,830.96 = 51,379.20/x
  3. Step 3: Cross multiply
    66,512.88x = 91,830.96 × 51,379.20
  4. Step 4: Simplify right side
    66,512.88x = 4,718,201,260.03
  5. Step 5: Solve for x
    x = 4,718,201,260.03/66,512.88
  6. Step 6: Final answer
    x = 70,936.66

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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.