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Finding the Fourth Proportional to 139,135,779.90, 208,703,669.85 and 48,259,368.90

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Solution

The fourth proportional to 139,135,779.90, 208,703,669.85 and 48,259,368.90 is: 72,389,053.35

Step by Step Solution

  1. Step 1: Write the proportion equation
    139,135,779.90 : 208,703,669.85 = 48,259,368.90 : x
  2. Step 2: Convert to fraction form
    139,135,779.90/208,703,669.85 = 48,259,368.90/x
  3. Step 3: Cross multiply
    139,135,779.90x = 208,703,669.85 × 48,259,368.90
  4. Step 4: Simplify right side
    139,135,779.90x = 10,071,907,394,074,958
  5. Step 5: Solve for x
    x = 10,071,907,394,074,958/139,135,779.90
  6. Step 6: Final answer
    x = 72,389,053.35

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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.