Home / 86,021.10-128,972.70-43,819.47

Finding the Fourth Proportional to 86,021.10, 128,972.70 and 43,819.47

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Solution

The fourth proportional to 86,021.10, 128,972.70 and 43,819.47 is: 65,699.18

Step by Step Solution

  1. Step 1: Write the proportion equation
    86,021.10 : 128,972.70 = 43,819.47 : x
  2. Step 2: Convert to fraction form
    86,021.10/128,972.70 = 43,819.47/x
  3. Step 3: Cross multiply
    86,021.10x = 128,972.70 × 43,819.47
  4. Step 4: Simplify right side
    86,021.10x = 5,651,515,358.47
  5. Step 5: Solve for x
    x = 5,651,515,358.47/86,021.10
  6. Step 6: Final answer
    x = 65,699.18

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.