Home / 138,518.03-191,143.42-78,103.51

Finding the Fourth Proportional to 138,518.03, 191,143.42 and 78,103.51

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Solution

The fourth proportional to 138,518.03, 191,143.42 and 78,103.51 is: 107,776.37

Step by Step Solution

  1. Step 1: Write the proportion equation
    138,518.03 : 191,143.42 = 78,103.51 : x
  2. Step 2: Convert to fraction form
    138,518.03/191,143.42 = 78,103.51/x
  3. Step 3: Cross multiply
    138,518.03x = 191,143.42 × 78,103.51
  4. Step 4: Simplify right side
    138,518.03x = 14,928,971,342.29
  5. Step 5: Solve for x
    x = 14,928,971,342.29/138,518.03
  6. Step 6: Final answer
    x = 107,776.37

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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.