Home / 100,725.74-139,023.99-78,878.67

Finding the Fourth Proportional to 100,725.74, 139,023.99 and 78,878.67

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Solution

The fourth proportional to 100,725.74, 139,023.99 and 78,878.67 is: 108,870.17

Step by Step Solution

  1. Step 1: Write the proportion equation
    100,725.74 : 139,023.99 = 78,878.67 : x
  2. Step 2: Convert to fraction form
    100,725.74/139,023.99 = 78,878.67/x
  3. Step 3: Cross multiply
    100,725.74x = 139,023.99 × 78,878.67
  4. Step 4: Simplify right side
    100,725.74x = 10,966,027,429.29
  5. Step 5: Solve for x
    x = 10,966,027,429.29/100,725.74
  6. Step 6: Final answer
    x = 108,870.17

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1.5x scale

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.