Home / 100,968.09-139,329.70-55,643.55

Finding the Fourth Proportional to 100,968.09, 139,329.70 and 55,643.55

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Solution

The fourth proportional to 100,968.09, 139,329.70 and 55,643.55 is: 76,784.65

Step by Step Solution

  1. Step 1: Write the proportion equation
    100,968.09 : 139,329.70 = 55,643.55 : x
  2. Step 2: Convert to fraction form
    100,968.09/139,329.70 = 55,643.55/x
  3. Step 3: Cross multiply
    100,968.09x = 139,329.70 × 55,643.55
  4. Step 4: Simplify right side
    100,968.09x = 7,752,799,128.44
  5. Step 5: Solve for x
    x = 7,752,799,128.44/100,968.09
  6. Step 6: Final answer
    x = 76,784.65

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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.