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Finding the Fourth Proportional to 66,986.40, 100,871.52 and 49,578.72

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Solution

The fourth proportional to 66,986.40, 100,871.52 and 49,578.72 is: 74,658.15

Step by Step Solution

  1. Step 1: Write the proportion equation
    66,986.40 : 100,871.52 = 49,578.72 : x
  2. Step 2: Convert to fraction form
    66,986.40/100,871.52 = 49,578.72/x
  3. Step 3: Cross multiply
    66,986.40x = 100,871.52 × 49,578.72
  4. Step 4: Simplify right side
    66,986.40x = 5,001,080,846.05
  5. Step 5: Solve for x
    x = 5,001,080,846.05/66,986.40
  6. Step 6: Final answer
    x = 74,658.15

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Why These Related Problems?

These problems maintain the same ratio (1.51) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.