Home / 100,720.35-139,005.90-57,713.77

Finding the Fourth Proportional to 100,720.35, 139,005.90 and 57,713.77

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Solution

The fourth proportional to 100,720.35, 139,005.90 and 57,713.77 is: 79,651.77

Step by Step Solution

  1. Step 1: Write the proportion equation
    100,720.35 : 139,005.90 = 57,713.77 : x
  2. Step 2: Convert to fraction form
    100,720.35/139,005.90 = 57,713.77/x
  3. Step 3: Cross multiply
    100,720.35x = 139,005.90 × 57,713.77
  4. Step 4: Simplify right side
    100,720.35x = 8,022,554,076.84
  5. Step 5: Solve for x
    x = 8,022,554,076.84/100,720.35
  6. Step 6: Final answer
    x = 79,651.77

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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.