Home / 138,405.08-190,999.69-77,976.68

Finding the Fourth Proportional to 138,405.08, 190,999.69 and 77,976.68

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Solution

The fourth proportional to 138,405.08, 190,999.69 and 77,976.68 is: 107,608.19

Step by Step Solution

  1. Step 1: Write the proportion equation
    138,405.08 : 190,999.69 = 77,976.68 : x
  2. Step 2: Convert to fraction form
    138,405.08/190,999.69 = 77,976.68/x
  3. Step 3: Cross multiply
    138,405.08x = 190,999.69 × 77,976.68
  4. Step 4: Simplify right side
    138,405.08x = 14,893,520,557.29
  5. Step 5: Solve for x
    x = 14,893,520,557.29/138,405.08
  6. Step 6: Final answer
    x = 107,608.19

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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.