Home / 135,621.83-187,119.29-78,256.55

Finding the Fourth Proportional to 135,621.83, 187,119.29 and 78,256.55

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Solution

The fourth proportional to 135,621.83, 187,119.29 and 78,256.55 is: 107,971.62

Step by Step Solution

  1. Step 1: Write the proportion equation
    135,621.83 : 187,119.29 = 78,256.55 : x
  2. Step 2: Convert to fraction form
    135,621.83/187,119.29 = 78,256.55/x
  3. Step 3: Cross multiply
    135,621.83x = 187,119.29 × 78,256.55
  4. Step 4: Simplify right side
    135,621.83x = 14,643,308,746.97
  5. Step 5: Solve for x
    x = 14,643,308,746.97/135,621.83
  6. Step 6: Final answer
    x = 107,971.62

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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.