Home / 39,781.20-54,899.28-21,878.04

Finding the Fourth Proportional to 39,781.20, 54,899.28 and 21,878.04

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Solution

The fourth proportional to 39,781.20, 54,899.28 and 21,878.04 is: 30,192.37

Step by Step Solution

  1. Step 1: Write the proportion equation
    39,781.20 : 54,899.28 = 21,878.04 : x
  2. Step 2: Convert to fraction form
    39,781.20/54,899.28 = 21,878.04/x
  3. Step 3: Cross multiply
    39,781.20x = 54,899.28 × 21,878.04
  4. Step 4: Simplify right side
    39,781.20x = 1,201,088,643.81
  5. Step 5: Solve for x
    x = 1,201,088,643.81/39,781.20
  6. Step 6: Final answer
    x = 30,192.37

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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.