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Finding the Fourth Proportional to 72,447,719.83, 99,978,380.37 and 39,408,254.28

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Solution

The fourth proportional to 72,447,719.83, 99,978,380.37 and 39,408,254.28 is: 54,383,677.57

Step by Step Solution

  1. Step 1: Write the proportion equation
    72,447,719.83 : 99,978,380.37 = 39,408,254.28 : x
  2. Step 2: Convert to fraction form
    72,447,719.83/99,978,380.37 = 39,408,254.28/x
  3. Step 3: Cross multiply
    72,447,719.83x = 99,978,380.37 × 39,408,254.28
  4. Step 4: Simplify right side
    72,447,719.83x = 3,939,973,436,123,521
  5. Step 5: Solve for x
    x = 3,939,973,436,123,521/72,447,719.83
  6. Step 6: Final answer
    x = 54,383,677.57

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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.