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Finding the Fourth Proportional to 66,639.91, 91,954.20 and 42,798.88

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Solution

The fourth proportional to 66,639.91, 91,954.20 and 42,798.88 is: 59,056.75

Step by Step Solution

  1. Step 1: Write the proportion equation
    66,639.91 : 91,954.20 = 42,798.88 : x
  2. Step 2: Convert to fraction form
    66,639.91/91,954.20 = 42,798.88/x
  3. Step 3: Cross multiply
    66,639.91x = 91,954.20 × 42,798.88
  4. Step 4: Simplify right side
    66,639.91x = 3,935,536,771.30
  5. Step 5: Solve for x
    x = 3,935,536,771.30/66,639.91
  6. Step 6: Final answer
    x = 59,056.75

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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.