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Finding the Fourth Proportional to 139,968,113.70, 209,952,170.55 and 138,624,420.90

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Solution

The fourth proportional to 139,968,113.70, 209,952,170.55 and 138,624,420.90 is: 207,936,631.35

Step by Step Solution

  1. Step 1: Write the proportion equation
    139,968,113.70 : 209,952,170.55 = 138,624,420.90 : x
  2. Step 2: Convert to fraction form
    139,968,113.70/209,952,170.55 = 138,624,420.90/x
  3. Step 3: Cross multiply
    139,968,113.70x = 209,952,170.55 × 138,624,420.90
  4. Step 4: Simplify right side
    139,968,113.70x = 29,104,498,059,191,788
  5. Step 5: Solve for x
    x = 29,104,498,059,191,788/139,968,113.70
  6. Step 6: Final answer
    x = 207,936,631.35

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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.