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Finding the Fourth Proportional to 139,968,147.80, 209,952,221.70 and 71,817,728.60

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Solution

The fourth proportional to 139,968,147.80, 209,952,221.70 and 71,817,728.60 is: 107,726,592.90

Step by Step Solution

  1. Step 1: Write the proportion equation
    139,968,147.80 : 209,952,221.70 = 71,817,728.60 : x
  2. Step 2: Convert to fraction form
    139,968,147.80/209,952,221.70 = 71,817,728.60/x
  3. Step 3: Cross multiply
    139,968,147.80x = 209,952,221.70 × 71,817,728.60
  4. Step 4: Simplify right side
    139,968,147.80x = 15,078,291,677,017,628
  5. Step 5: Solve for x
    x = 15,078,291,677,017,628/139,968,147.80
  6. Step 6: Final answer
    x = 107,726,592.90

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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.