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Finding the Fourth Proportional to 140,515.20, 210,772.80 and 81,466.20

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Solution

The fourth proportional to 140,515.20, 210,772.80 and 81,466.20 is: 122,199.30

Step by Step Solution

  1. Step 1: Write the proportion equation
    140,515.20 : 210,772.80 = 81,466.20 : x
  2. Step 2: Convert to fraction form
    140,515.20/210,772.80 = 81,466.20/x
  3. Step 3: Cross multiply
    140,515.20x = 210,772.80 × 81,466.20
  4. Step 4: Simplify right side
    140,515.20x = 17,170,859,079.36
  5. Step 5: Solve for x
    x = 17,170,859,079.36/140,515.20
  6. Step 6: Final answer
    x = 122,199.30

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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.