Home / 100,721.07-139,004.10-55,408.05

Finding the Fourth Proportional to 100,721.07, 139,004.10 and 55,408.05

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Solution

The fourth proportional to 100,721.07, 139,004.10 and 55,408.05 is: 76,468.07

Step by Step Solution

  1. Step 1: Write the proportion equation
    100,721.07 : 139,004.10 = 55,408.05 : x
  2. Step 2: Convert to fraction form
    100,721.07/139,004.10 = 55,408.05/x
  3. Step 3: Cross multiply
    100,721.07x = 139,004.10 × 55,408.05
  4. Step 4: Simplify right side
    100,721.07x = 7,701,946,123.01
  5. Step 5: Solve for x
    x = 7,701,946,123.01/100,721.07
  6. Step 6: Final answer
    x = 76,468.07

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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.