Home / 100,743.89-139,029.93-55,423.78

Finding the Fourth Proportional to 100,743.89, 139,029.93 and 55,423.78

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Solution

The fourth proportional to 100,743.89, 139,029.93 and 55,423.78 is: 76,486.67

Step by Step Solution

  1. Step 1: Write the proportion equation
    100,743.89 : 139,029.93 = 55,423.78 : x
  2. Step 2: Convert to fraction form
    100,743.89/139,029.93 = 55,423.78/x
  3. Step 3: Cross multiply
    100,743.89x = 139,029.93 × 55,423.78
  4. Step 4: Simplify right side
    100,743.89x = 7,705,563,906.16
  5. Step 5: Solve for x
    x = 7,705,563,906.16/100,743.89
  6. Step 6: Final answer
    x = 76,486.67

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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.