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Finding the Fourth Proportional to 18,721,605.60, 28,082,408.40 and 9,143,128.80

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Solution

The fourth proportional to 18,721,605.60, 28,082,408.40 and 9,143,128.80 is: 13,714,693.20

Step by Step Solution

  1. Step 1: Write the proportion equation
    18,721,605.60 : 28,082,408.40 = 9,143,128.80 : x
  2. Step 2: Convert to fraction form
    18,721,605.60/28,082,408.40 = 9,143,128.80/x
  3. Step 3: Cross multiply
    18,721,605.60x = 28,082,408.40 × 9,143,128.80
  4. Step 4: Simplify right side
    18,721,605.60x = 256,761,077,015,401.94
  5. Step 5: Solve for x
    x = 256,761,077,015,401.94/18,721,605.60
  6. Step 6: Final answer
    x = 13,714,693.20

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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.