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Finding the Fourth Proportional to 20,552,679.40, 30,819,687.90 and 7,768,935.40

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Solution

The fourth proportional to 20,552,679.40, 30,819,687.90 and 7,768,935.40 is: 11,649,875.90

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,552,679.40 : 30,819,687.90 = 7,768,935.40 : x
  2. Step 2: Convert to fraction form
    20,552,679.40/30,819,687.90 = 7,768,935.40/x
  3. Step 3: Cross multiply
    20,552,679.40x = 30,819,687.90 × 7,768,935.40
  4. Step 4: Simplify right side
    20,552,679.40x = 239,436,164,343,261.66
  5. Step 5: Solve for x
    x = 239,436,164,343,261.66/20,552,679.40
  6. Step 6: Final answer
    x = 11,649,875.90

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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.