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Finding the Fourth Proportional to 139,809.94, 192,943.14 and 79,386.18

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Solution

The fourth proportional to 139,809.94, 192,943.14 and 79,386.18 is: 109,556.01

Step by Step Solution

  1. Step 1: Write the proportion equation
    139,809.94 : 192,943.14 = 79,386.18 : x
  2. Step 2: Convert to fraction form
    139,809.94/192,943.14 = 79,386.18/x
  3. Step 3: Cross multiply
    139,809.94x = 192,943.14 × 79,386.18
  4. Step 4: Simplify right side
    139,809.94x = 15,317,018,841.81
  5. Step 5: Solve for x
    x = 15,317,018,841.81/139,809.94
  6. Step 6: Final answer
    x = 109,556.01

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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.