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Finding the Fourth Proportional to 66,108.64, 91,103.53 and 64,893.95

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Solution

The fourth proportional to 66,108.64, 91,103.53 and 64,893.95 is: 89,429.57

Step by Step Solution

  1. Step 1: Write the proportion equation
    66,108.64 : 91,103.53 = 64,893.95 : x
  2. Step 2: Convert to fraction form
    66,108.64/91,103.53 = 64,893.95/x
  3. Step 3: Cross multiply
    66,108.64x = 91,103.53 × 64,893.95
  4. Step 4: Simplify right side
    66,108.64x = 5,912,067,302.89
  5. Step 5: Solve for x
    x = 5,912,067,302.89/66,108.64
  6. Step 6: Final answer
    x = 89,429.57

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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.