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Finding the Fourth Proportional to 139,968,685.80, 209,953,028.70 and 105,480,570.60

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Solution

The fourth proportional to 139,968,685.80, 209,953,028.70 and 105,480,570.60 is: 158,220,855.90

Step by Step Solution

  1. Step 1: Write the proportion equation
    139,968,685.80 : 209,953,028.70 = 105,480,570.60 : x
  2. Step 2: Convert to fraction form
    139,968,685.80/209,953,028.70 = 105,480,570.60/x
  3. Step 3: Cross multiply
    139,968,685.80x = 209,953,028.70 × 105,480,570.60
  4. Step 4: Simplify right side
    139,968,685.80x = 22,145,965,266,474,172
  5. Step 5: Solve for x
    x = 22,145,965,266,474,172/139,968,685.80
  6. Step 6: Final answer
    x = 158,220,855.90

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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.