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Finding the Fourth Proportional to 139,038.55, 208,557.78 and 120,262.75

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Solution

The fourth proportional to 139,038.55, 208,557.78 and 120,262.75 is: 180,394.09

Step by Step Solution

  1. Step 1: Write the proportion equation
    139,038.55 : 208,557.78 = 120,262.75 : x
  2. Step 2: Convert to fraction form
    139,038.55/208,557.78 = 120,262.75/x
  3. Step 3: Cross multiply
    139,038.55x = 208,557.78 × 120,262.75
  4. Step 4: Simplify right side
    139,038.55x = 25,081,732,156.70
  5. Step 5: Solve for x
    x = 25,081,732,156.70/139,038.55
  6. Step 6: Final answer
    x = 180,394.09

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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.