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Finding the Fourth Proportional to 139,969.30, 210,172.65 and 80,920.30

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Solution

The fourth proportional to 139,969.30, 210,172.65 and 80,920.30 is: 121,506.89

Step by Step Solution

  1. Step 1: Write the proportion equation
    139,969.30 : 210,172.65 = 80,920.30 : x
  2. Step 2: Convert to fraction form
    139,969.30/210,172.65 = 80,920.30/x
  3. Step 3: Cross multiply
    139,969.30x = 210,172.65 × 80,920.30
  4. Step 4: Simplify right side
    139,969.30x = 17,007,233,889.80
  5. Step 5: Solve for x
    x = 17,007,233,889.80/139,969.30
  6. Step 6: Final answer
    x = 121,506.89

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1.5x scale

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.