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Finding the Fourth Proportional to 66,639.28, 91,959.50 and 39,433

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Solution

The fourth proportional to 66,639.28, 91,959.50 and 39,433 is: 54,415.94

Step by Step Solution

  1. Step 1: Write the proportion equation
    66,639.28 : 91,959.50 = 39,433 : x
  2. Step 2: Convert to fraction form
    66,639.28/91,959.50 = 39,433/x
  3. Step 3: Cross multiply
    66,639.28x = 91,959.50 × 39,433
  4. Step 4: Simplify right side
    66,639.28x = 3,626,238,963.50
  5. Step 5: Solve for x
    x = 3,626,238,963.50/66,639.28
  6. Step 6: Final answer
    x = 54,415.94

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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.