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Finding the Fourth Proportional to 139,345.70, 192,290.61 and 78,916.77

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Solution

The fourth proportional to 139,345.70, 192,290.61 and 78,916.77 is: 108,901.49

Step by Step Solution

  1. Step 1: Write the proportion equation
    139,345.70 : 192,290.61 = 78,916.77 : x
  2. Step 2: Convert to fraction form
    139,345.70/192,290.61 = 78,916.77/x
  3. Step 3: Cross multiply
    139,345.70x = 192,290.61 × 78,916.77
  4. Step 4: Simplify right side
    139,345.70x = 15,174,953,842.53
  5. Step 5: Solve for x
    x = 15,174,953,842.53/139,345.70
  6. Step 6: Final answer
    x = 108,901.49

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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.