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Finding the Fourth Proportional to 139,907.29, 209,890.93 and 45,142.89

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Solution

The fourth proportional to 139,907.29, 209,890.93 and 45,142.89 is: 67,724.01

Step by Step Solution

  1. Step 1: Write the proportion equation
    139,907.29 : 209,890.93 = 45,142.89 : x
  2. Step 2: Convert to fraction form
    139,907.29/209,890.93 = 45,142.89/x
  3. Step 3: Cross multiply
    139,907.29x = 209,890.93 × 45,142.89
  4. Step 4: Simplify right side
    139,907.29x = 9,475,083,164.99
  5. Step 5: Solve for x
    x = 9,475,083,164.99/139,907.29
  6. Step 6: Final answer
    x = 67,724.01

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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.