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Finding the Fourth Proportional to 143,413,409.40, 215,438,978.70 and 137,992,711.20

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Solution

The fourth proportional to 143,413,409.40, 215,438,978.70 and 137,992,711.20 is: 207,295,879.05

Step by Step Solution

  1. Step 1: Write the proportion equation
    143,413,409.40 : 215,438,978.70 = 137,992,711.20 : x
  2. Step 2: Convert to fraction form
    143,413,409.40/215,438,978.70 = 137,992,711.20/x
  3. Step 3: Cross multiply
    143,413,409.40x = 215,438,978.70 × 137,992,711.20
  4. Step 4: Simplify right side
    143,413,409.40x = 29,729,008,768,972,048
  5. Step 5: Solve for x
    x = 29,729,008,768,972,048/143,413,409.40
  6. Step 6: Final answer
    x = 207,295,879.05

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These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.