Home / 138,919.11-191,696.99-78,495

Finding the Fourth Proportional to 138,919.11, 191,696.99 and 78,495

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Solution

The fourth proportional to 138,919.11, 191,696.99 and 78,495 is: 108,316.67

Step by Step Solution

  1. Step 1: Write the proportion equation
    138,919.11 : 191,696.99 = 78,495 : x
  2. Step 2: Convert to fraction form
    138,919.11/191,696.99 = 78,495/x
  3. Step 3: Cross multiply
    138,919.11x = 191,696.99 × 78,495
  4. Step 4: Simplify right side
    138,919.11x = 15,047,254,837.58
  5. Step 5: Solve for x
    x = 15,047,254,837.58/138,919.11
  6. Step 6: Final answer
    x = 108,316.67

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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.