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Finding the Fourth Proportional to 81,780,122.80, 122,565,985.80 and 43,459,994.80

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Solution

The fourth proportional to 81,780,122.80, 122,565,985.80 and 43,459,994.80 is: 65,134,618.57

Step by Step Solution

  1. Step 1: Write the proportion equation
    81,780,122.80 : 122,565,985.80 = 43,459,994.80 : x
  2. Step 2: Convert to fraction form
    81,780,122.80/122,565,985.80 = 43,459,994.80/x
  3. Step 3: Cross multiply
    81,780,122.80x = 122,565,985.80 × 43,459,994.80
  4. Step 4: Simplify right side
    81,780,122.80x = 5,326,717,105,524,873
  5. Step 5: Solve for x
    x = 5,326,717,105,524,873/81,780,122.80
  6. Step 6: Final answer
    x = 65,134,618.57

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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.