Home / 100,781.16-139,083.75-57,767.81

Finding the Fourth Proportional to 100,781.16, 139,083.75 and 57,767.81

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Solution

The fourth proportional to 100,781.16, 139,083.75 and 57,767.81 is: 79,722.87

Step by Step Solution

  1. Step 1: Write the proportion equation
    100,781.16 : 139,083.75 = 57,767.81 : x
  2. Step 2: Convert to fraction form
    100,781.16/139,083.75 = 57,767.81/x
  3. Step 3: Cross multiply
    100,781.16x = 139,083.75 × 57,767.81
  4. Step 4: Simplify right side
    100,781.16x = 8,034,563,096.13
  5. Step 5: Solve for x
    x = 8,034,563,096.13/100,781.16
  6. Step 6: Final answer
    x = 79,722.87

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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.