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Finding the Fourth Proportional to 139,978,829.20, 209,968,243.80 and 88,897,507.60

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Solution

The fourth proportional to 139,978,829.20, 209,968,243.80 and 88,897,507.60 is: 133,346,261.40

Step by Step Solution

  1. Step 1: Write the proportion equation
    139,978,829.20 : 209,968,243.80 = 88,897,507.60 : x
  2. Step 2: Convert to fraction form
    139,978,829.20/209,968,243.80 = 88,897,507.60/x
  3. Step 3: Cross multiply
    139,978,829.20x = 209,968,243.80 × 88,897,507.60
  4. Step 4: Simplify right side
    139,978,829.20x = 18,665,653,548,969,152
  5. Step 5: Solve for x
    x = 18,665,653,548,969,152/139,978,829.20
  6. Step 6: Final answer
    x = 133,346,261.40

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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.