Home / 100,814.40-139,137.12-57,810.72

Finding the Fourth Proportional to 100,814.40, 139,137.12 and 57,810.72

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Solution

The fourth proportional to 100,814.40, 139,137.12 and 57,810.72 is: 79,786.39

Step by Step Solution

  1. Step 1: Write the proportion equation
    100,814.40 : 139,137.12 = 57,810.72 : x
  2. Step 2: Convert to fraction form
    100,814.40/139,137.12 = 57,810.72/x
  3. Step 3: Cross multiply
    100,814.40x = 139,137.12 × 57,810.72
  4. Step 4: Simplify right side
    100,814.40x = 8,043,617,085.93
  5. Step 5: Solve for x
    x = 8,043,617,085.93/100,814.40
  6. Step 6: Final answer
    x = 79,786.39

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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.