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Finding the Fourth Proportional to 139,172.25, 208,794.03 and 45,678.81

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Solution

The fourth proportional to 139,172.25, 208,794.03 and 45,678.81 is: 68,529.92

Step by Step Solution

  1. Step 1: Write the proportion equation
    139,172.25 : 208,794.03 = 45,678.81 : x
  2. Step 2: Convert to fraction form
    139,172.25/208,794.03 = 45,678.81/x
  3. Step 3: Cross multiply
    139,172.25x = 208,794.03 × 45,678.81
  4. Step 4: Simplify right side
    139,172.25x = 9,537,462,825.50
  5. Step 5: Solve for x
    x = 9,537,462,825.50/139,172.25
  6. Step 6: Final answer
    x = 68,529.92

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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.