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Finding the Fourth Proportional to 139,969,205.70, 209,953,808.55 and 42,939,888.90

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Solution

The fourth proportional to 139,969,205.70, 209,953,808.55 and 42,939,888.90 is: 64,409,833.35

Step by Step Solution

  1. Step 1: Write the proportion equation
    139,969,205.70 : 209,953,808.55 = 42,939,888.90 : x
  2. Step 2: Convert to fraction form
    139,969,205.70/209,953,808.55 = 42,939,888.90/x
  3. Step 3: Cross multiply
    139,969,205.70x = 209,953,808.55 × 42,939,888.90
  4. Step 4: Simplify right side
    139,969,205.70x = 9,015,393,213,268,870
  5. Step 5: Solve for x
    x = 9,015,393,213,268,870/139,969,205.70
  6. Step 6: Final answer
    x = 64,409,833.35

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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.