Home / 100,731.18-139,012.65-55,412.73

Finding the Fourth Proportional to 100,731.18, 139,012.65 and 55,412.73

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Solution

The fourth proportional to 100,731.18, 139,012.65 and 55,412.73 is: 76,471.56

Step by Step Solution

  1. Step 1: Write the proportion equation
    100,731.18 : 139,012.65 = 55,412.73 : x
  2. Step 2: Convert to fraction form
    100,731.18/139,012.65 = 55,412.73/x
  3. Step 3: Cross multiply
    100,731.18x = 139,012.65 × 55,412.73
  4. Step 4: Simplify right side
    100,731.18x = 7,703,070,441.03
  5. Step 5: Solve for x
    x = 7,703,070,441.03/100,731.18
  6. Step 6: Final answer
    x = 76,471.56

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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.