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Finding the Fourth Proportional to 1,212,987.20, 1,815,981.60 and 1,212,987.20

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Solution

The fourth proportional to 1,212,987.20, 1,815,981.60 and 1,212,987.20 is: 1,815,981.60

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,212,987.20 : 1,815,981.60 = 1,212,987.20 : x
  2. Step 2: Convert to fraction form
    1,212,987.20/1,815,981.60 = 1,212,987.20/x
  3. Step 3: Cross multiply
    1,212,987.20x = 1,815,981.60 × 1,212,987.20
  4. Step 4: Simplify right side
    1,212,987.20x = 2,202,762,436,235.52
  5. Step 5: Solve for x
    x = 2,202,762,436,235.52/1,212,987.20
  6. Step 6: Final answer
    x = 1,815,981.60

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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.