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Finding the Fourth Proportional to 20,915,893.16, 28,859,203.50 and 12,655,749.96

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Solution

The fourth proportional to 20,915,893.16, 28,859,203.50 and 12,655,749.96 is: 17,462,073.49

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,915,893.16 : 28,859,203.50 = 12,655,749.96 : x
  2. Step 2: Convert to fraction form
    20,915,893.16/28,859,203.50 = 12,655,749.96/x
  3. Step 3: Cross multiply
    20,915,893.16x = 28,859,203.50 × 12,655,749.96
  4. Step 4: Simplify right side
    20,915,893.16x = 365,234,863,540,756.88
  5. Step 5: Solve for x
    x = 365,234,863,540,756.88/20,915,893.16
  6. Step 6: Final answer
    x = 17,462,073.49

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.