Home / 129,103.17-178,167.73-71,742.28

Finding the Fourth Proportional to 129,103.17, 178,167.73 and 71,742.28

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Solution

The fourth proportional to 129,103.17, 178,167.73 and 71,742.28 is: 99,007.32

Step by Step Solution

  1. Step 1: Write the proportion equation
    129,103.17 : 178,167.73 = 71,742.28 : x
  2. Step 2: Convert to fraction form
    129,103.17/178,167.73 = 71,742.28/x
  3. Step 3: Cross multiply
    129,103.17x = 178,167.73 × 71,742.28
  4. Step 4: Simplify right side
    129,103.17x = 12,782,159,172.62
  5. Step 5: Solve for x
    x = 12,782,159,172.62/129,103.17
  6. Step 6: Final answer
    x = 99,007.32

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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.