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Finding the Fourth Proportional to 139,445.66, 209,136.12 and 68,297.31

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Solution

The fourth proportional to 139,445.66, 209,136.12 and 68,297.31 is: 102,430.11

Step by Step Solution

  1. Step 1: Write the proportion equation
    139,445.66 : 209,136.12 = 68,297.31 : x
  2. Step 2: Convert to fraction form
    139,445.66/209,136.12 = 68,297.31/x
  3. Step 3: Cross multiply
    139,445.66x = 209,136.12 × 68,297.31
  4. Step 4: Simplify right side
    139,445.66x = 14,283,434,419.84
  5. Step 5: Solve for x
    x = 14,283,434,419.84/139,445.66
  6. Step 6: Final answer
    x = 102,430.11

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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.