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Finding the Fourth Proportional to 102,158.56, 140,981.52 and 61,879.60

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Solution

The fourth proportional to 102,158.56, 140,981.52 and 61,879.60 is: 85,395.49

Step by Step Solution

  1. Step 1: Write the proportion equation
    102,158.56 : 140,981.52 = 61,879.60 : x
  2. Step 2: Convert to fraction form
    102,158.56/140,981.52 = 61,879.60/x
  3. Step 3: Cross multiply
    102,158.56x = 140,981.52 × 61,879.60
  4. Step 4: Simplify right side
    102,158.56x = 8,723,880,064.99
  5. Step 5: Solve for x
    x = 8,723,880,064.99/102,158.56
  6. Step 6: Final answer
    x = 85,395.49

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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.