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Finding the Fourth Proportional to 12,905,812.80, 19,369,216.80 and 12,485,908.80

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Solution

The fourth proportional to 12,905,812.80, 19,369,216.80 and 12,485,908.80 is: 18,739,019.25

Step by Step Solution

  1. Step 1: Write the proportion equation
    12,905,812.80 : 19,369,216.80 = 12,485,908.80 : x
  2. Step 2: Convert to fraction form
    12,905,812.80/19,369,216.80 = 12,485,908.80/x
  3. Step 3: Cross multiply
    12,905,812.80x = 19,369,216.80 × 12,485,908.80
  4. Step 4: Simplify right side
    12,905,812.80x = 241,842,274,492,227.88
  5. Step 5: Solve for x
    x = 241,842,274,492,227.88/12,905,812.80
  6. Step 6: Final answer
    x = 18,739,019.25

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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.