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Finding the Fourth Proportional to 12,921,902.40, 19,381,298.40 and 5,348,078.40

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Solution

The fourth proportional to 12,921,902.40, 19,381,298.40 and 5,348,078.40 is: 8,021,473.94

Step by Step Solution

  1. Step 1: Write the proportion equation
    12,921,902.40 : 19,381,298.40 = 5,348,078.40 : x
  2. Step 2: Convert to fraction form
    12,921,902.40/19,381,298.40 = 5,348,078.40/x
  3. Step 3: Cross multiply
    12,921,902.40x = 19,381,298.40 × 5,348,078.40
  4. Step 4: Simplify right side
    12,921,902.40x = 103,652,703,336,994.56
  5. Step 5: Solve for x
    x = 103,652,703,336,994.56/12,921,902.40
  6. Step 6: Final answer
    x = 8,021,473.94

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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.