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Finding the Fourth Proportional to 20,991,638.10, 31,487,457.15 and 20,991,638.10

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Solution

The fourth proportional to 20,991,638.10, 31,487,457.15 and 20,991,638.10 is: 31,487,457.15

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,991,638.10 : 31,487,457.15 = 20,991,638.10 : x
  2. Step 2: Convert to fraction form
    20,991,638.10/31,487,457.15 = 20,991,638.10/x
  3. Step 3: Cross multiply
    20,991,638.10x = 31,487,457.15 × 20,991,638.10
  4. Step 4: Simplify right side
    20,991,638.10x = 660,973,305,182,057.38
  5. Step 5: Solve for x
    x = 660,973,305,182,057.38/20,991,638.10
  6. Step 6: Final answer
    x = 31,487,457.15

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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.