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Finding the Fourth Proportional to 139,969.65, 210,003.08 and 61,140.45

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Solution

The fourth proportional to 139,969.65, 210,003.08 and 61,140.45 is: 91,731.90

Step by Step Solution

  1. Step 1: Write the proportion equation
    139,969.65 : 210,003.08 = 61,140.45 : x
  2. Step 2: Convert to fraction form
    139,969.65/210,003.08 = 61,140.45/x
  3. Step 3: Cross multiply
    139,969.65x = 210,003.08 × 61,140.45
  4. Step 4: Simplify right side
    139,969.65x = 12,839,682,506.88
  5. Step 5: Solve for x
    x = 12,839,682,506.88/139,969.65
  6. Step 6: Final answer
    x = 91,731.90

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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.