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Finding the Fourth Proportional to 140,912.40, 211,438.08 and 66,019.60

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Solution

The fourth proportional to 140,912.40, 211,438.08 and 66,019.60 is: 99,061.95

Step by Step Solution

  1. Step 1: Write the proportion equation
    140,912.40 : 211,438.08 = 66,019.60 : x
  2. Step 2: Convert to fraction form
    140,912.40/211,438.08 = 66,019.60/x
  3. Step 3: Cross multiply
    140,912.40x = 211,438.08 × 66,019.60
  4. Step 4: Simplify right side
    140,912.40x = 13,959,057,466.37
  5. Step 5: Solve for x
    x = 13,959,057,466.37/140,912.40
  6. Step 6: Final answer
    x = 99,061.95

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.