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Finding the Fourth Proportional to 20,991,213.60, 31,486,820.40 and 20,991,213.60

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Solution

The fourth proportional to 20,991,213.60, 31,486,820.40 and 20,991,213.60 is: 31,486,820.40

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,991,213.60 : 31,486,820.40 = 20,991,213.60 : x
  2. Step 2: Convert to fraction form
    20,991,213.60/31,486,820.40 = 20,991,213.60/x
  3. Step 3: Cross multiply
    20,991,213.60x = 31,486,820.40 × 20,991,213.60
  4. Step 4: Simplify right side
    20,991,213.60x = 660,946,572,601,237.50
  5. Step 5: Solve for x
    x = 660,946,572,601,237.50/20,991,213.60
  6. Step 6: Final answer
    x = 31,486,820.40

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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.