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Finding the Fourth Proportional to 100,809.97, 139,116.65 and 55,486.98

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Solution

The fourth proportional to 100,809.97, 139,116.65 and 55,486.98 is: 76,571.42

Step by Step Solution

  1. Step 1: Write the proportion equation
    100,809.97 : 139,116.65 = 55,486.98 : x
  2. Step 2: Convert to fraction form
    100,809.97/139,116.65 = 55,486.98/x
  3. Step 3: Cross multiply
    100,809.97x = 139,116.65 × 55,486.98
  4. Step 4: Simplify right side
    100,809.97x = 7,719,162,080.63
  5. Step 5: Solve for x
    x = 7,719,162,080.63/100,809.97
  6. Step 6: Final answer
    x = 76,571.42

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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.