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Finding the Fourth Proportional to 121,318,912.60, 181,978,368.90 and 75,402,410.20

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Solution

The fourth proportional to 121,318,912.60, 181,978,368.90 and 75,402,410.20 is: 113,103,615.30

Step by Step Solution

  1. Step 1: Write the proportion equation
    121,318,912.60 : 181,978,368.90 = 75,402,410.20 : x
  2. Step 2: Convert to fraction form
    121,318,912.60/181,978,368.90 = 75,402,410.20/x
  3. Step 3: Cross multiply
    121,318,912.60x = 181,978,368.90 × 75,402,410.20
  4. Step 4: Simplify right side
    121,318,912.60x = 13,721,607,619,324,724
  5. Step 5: Solve for x
    x = 13,721,607,619,324,724/121,318,912.60
  6. Step 6: Final answer
    x = 113,103,615.30

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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.