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Finding the Fourth Proportional to 69,872,718.60, 104,809,077.90 and 18,759,904.20

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Solution

The fourth proportional to 69,872,718.60, 104,809,077.90 and 18,759,904.20 is: 28,139,856.30

Step by Step Solution

  1. Step 1: Write the proportion equation
    69,872,718.60 : 104,809,077.90 = 18,759,904.20 : x
  2. Step 2: Convert to fraction form
    69,872,718.60/104,809,077.90 = 18,759,904.20/x
  3. Step 3: Cross multiply
    69,872,718.60x = 104,809,077.90 × 18,759,904.20
  4. Step 4: Simplify right side
    69,872,718.60x = 1,966,208,260,694,337.25
  5. Step 5: Solve for x
    x = 1,966,208,260,694,337.25/69,872,718.60
  6. Step 6: Final answer
    x = 28,139,856.30

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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.