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Finding the Fourth Proportional to 100,790.94, 139,088.52 and 54,849.09

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Solution

The fourth proportional to 100,790.94, 139,088.52 and 54,849.09 is: 75,690.12

Step by Step Solution

  1. Step 1: Write the proportion equation
    100,790.94 : 139,088.52 = 54,849.09 : x
  2. Step 2: Convert to fraction form
    100,790.94/139,088.52 = 54,849.09/x
  3. Step 3: Cross multiply
    100,790.94x = 139,088.52 × 54,849.09
  4. Step 4: Simplify right side
    100,790.94x = 7,628,878,751.45
  5. Step 5: Solve for x
    x = 7,628,878,751.45/100,790.94
  6. Step 6: Final answer
    x = 75,690.12

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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.