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Finding the Fourth Proportional to 20,391,326.90, 30,603,720.90 and 20,231,894.60

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Solution

The fourth proportional to 20,391,326.90, 30,603,720.90 and 20,231,894.60 is: 30,364,441.64

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,391,326.90 : 30,603,720.90 = 20,231,894.60 : x
  2. Step 2: Convert to fraction form
    20,391,326.90/30,603,720.90 = 20,231,894.60/x
  3. Step 3: Cross multiply
    20,391,326.90x = 30,603,720.90 × 20,231,894.60
  4. Step 4: Simplify right side
    20,391,326.90x = 619,171,255,616,617.12
  5. Step 5: Solve for x
    x = 619,171,255,616,617.12/20,391,326.90
  6. Step 6: Final answer
    x = 30,364,441.64

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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.