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Finding the Fourth Proportional to 120,660,571.20, 180,990,856.80 and 120,660,571.20

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Solution

The fourth proportional to 120,660,571.20, 180,990,856.80 and 120,660,571.20 is: 180,990,856.80

Step by Step Solution

  1. Step 1: Write the proportion equation
    120,660,571.20 : 180,990,856.80 = 120,660,571.20 : x
  2. Step 2: Convert to fraction form
    120,660,571.20/180,990,856.80 = 120,660,571.20/x
  3. Step 3: Cross multiply
    120,660,571.20x = 180,990,856.80 × 120,660,571.20
  4. Step 4: Simplify right side
    120,660,571.20x = 21,838,460,163,465,408
  5. Step 5: Solve for x
    x = 21,838,460,163,465,408/120,660,571.20
  6. Step 6: Final answer
    x = 180,990,856.80

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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.