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Finding the Fourth Proportional to 139,211.70, 208,817.55 and 103,782.30

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Solution

The fourth proportional to 139,211.70, 208,817.55 and 103,782.30 is: 155,673.45

Step by Step Solution

  1. Step 1: Write the proportion equation
    139,211.70 : 208,817.55 = 103,782.30 : x
  2. Step 2: Convert to fraction form
    139,211.70/208,817.55 = 103,782.30/x
  3. Step 3: Cross multiply
    139,211.70x = 208,817.55 × 103,782.30
  4. Step 4: Simplify right side
    139,211.70x = 21,671,565,619.37
  5. Step 5: Solve for x
    x = 21,671,565,619.37/139,211.70
  6. Step 6: Final answer
    x = 155,673.45

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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.