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Finding the Fourth Proportional to 139,968,993.60, 209,953,490.40 and 129,765,326.40

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Solution

The fourth proportional to 139,968,993.60, 209,953,490.40 and 129,765,326.40 is: 194,647,989.60

Step by Step Solution

  1. Step 1: Write the proportion equation
    139,968,993.60 : 209,953,490.40 = 129,765,326.40 : x
  2. Step 2: Convert to fraction form
    139,968,993.60/209,953,490.40 = 129,765,326.40/x
  3. Step 3: Cross multiply
    139,968,993.60x = 209,953,490.40 × 129,765,326.40
  4. Step 4: Simplify right side
    139,968,993.60x = 27,244,683,210,575,268
  5. Step 5: Solve for x
    x = 27,244,683,210,575,268/139,968,993.60
  6. Step 6: Final answer
    x = 194,647,989.60

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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.