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Finding the Fourth Proportional to 142,019,993.80, 213,029,990.70 and 81,553,817.80

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Solution

The fourth proportional to 142,019,993.80, 213,029,990.70 and 81,553,817.80 is: 122,330,726.70

Step by Step Solution

  1. Step 1: Write the proportion equation
    142,019,993.80 : 213,029,990.70 = 81,553,817.80 : x
  2. Step 2: Convert to fraction form
    142,019,993.80/213,029,990.70 = 81,553,817.80/x
  3. Step 3: Cross multiply
    142,019,993.80x = 213,029,990.70 × 81,553,817.80
  4. Step 4: Simplify right side
    142,019,993.80x = 17,373,409,047,483,492
  5. Step 5: Solve for x
    x = 17,373,409,047,483,492/142,019,993.80
  6. Step 6: Final answer
    x = 122,330,726.70

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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.