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Finding the Fourth Proportional to 135,879.39, 187,471.51 and 78,497.77

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Solution

The fourth proportional to 135,879.39, 187,471.51 and 78,497.77 is: 108,302.63

Step by Step Solution

  1. Step 1: Write the proportion equation
    135,879.39 : 187,471.51 = 78,497.77 : x
  2. Step 2: Convert to fraction form
    135,879.39/187,471.51 = 78,497.77/x
  3. Step 3: Cross multiply
    135,879.39x = 187,471.51 × 78,497.77
  4. Step 4: Simplify right side
    135,879.39x = 14,716,095,511.63
  5. Step 5: Solve for x
    x = 14,716,095,511.63/135,879.39
  6. Step 6: Final answer
    x = 108,302.63

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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.