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Finding the Fourth Proportional to 143,758.80, 215,897.40 and 139,093.20

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Solution

The fourth proportional to 143,758.80, 215,897.40 and 139,093.20 is: 208,890.59

Step by Step Solution

  1. Step 1: Write the proportion equation
    143,758.80 : 215,897.40 = 139,093.20 : x
  2. Step 2: Convert to fraction form
    143,758.80/215,897.40 = 139,093.20/x
  3. Step 3: Cross multiply
    143,758.80x = 215,897.40 × 139,093.20
  4. Step 4: Simplify right side
    143,758.80x = 30,029,860,237.68
  5. Step 5: Solve for x
    x = 30,029,860,237.68/143,758.80
  6. Step 6: Final answer
    x = 208,890.59

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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.