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Finding the Fourth Proportional to 100,903.51, 139,247.81 and 55,581.69

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Solution

The fourth proportional to 100,903.51, 139,247.81 and 55,581.69 is: 76,703.26

Step by Step Solution

  1. Step 1: Write the proportion equation
    100,903.51 : 139,247.81 = 55,581.69 : x
  2. Step 2: Convert to fraction form
    100,903.51/139,247.81 = 55,581.69/x
  3. Step 3: Cross multiply
    100,903.51x = 139,247.81 × 55,581.69
  4. Step 4: Simplify right side
    100,903.51x = 7,739,628,608.60
  5. Step 5: Solve for x
    x = 7,739,628,608.60/100,903.51
  6. Step 6: Final answer
    x = 76,703.26

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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.