Home / 129,501.43-178,720.20-78,519.04

Finding the Fourth Proportional to 129,501.43, 178,720.20 and 78,519.04

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Solution

The fourth proportional to 129,501.43, 178,720.20 and 78,519.04 is: 108,361.26

Step by Step Solution

  1. Step 1: Write the proportion equation
    129,501.43 : 178,720.20 = 78,519.04 : x
  2. Step 2: Convert to fraction form
    129,501.43/178,720.20 = 78,519.04/x
  3. Step 3: Cross multiply
    129,501.43x = 178,720.20 × 78,519.04
  4. Step 4: Simplify right side
    129,501.43x = 14,032,938,085.81
  5. Step 5: Solve for x
    x = 14,032,938,085.81/129,501.43
  6. Step 6: Final answer
    x = 108,361.26

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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.