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Finding the Fourth Proportional to 100,882.50, 139,255.92 and 79,315.98

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Solution

The fourth proportional to 100,882.50, 139,255.92 and 79,315.98 is: 109,485.98

Step by Step Solution

  1. Step 1: Write the proportion equation
    100,882.50 : 139,255.92 = 79,315.98 : x
  2. Step 2: Convert to fraction form
    100,882.50/139,255.92 = 79,315.98/x
  3. Step 3: Cross multiply
    100,882.50x = 139,255.92 × 79,315.98
  4. Step 4: Simplify right side
    100,882.50x = 11,045,219,765.60
  5. Step 5: Solve for x
    x = 11,045,219,765.60/100,882.50
  6. Step 6: Final answer
    x = 109,485.98

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.