Home / 85,128.48-117,424.05-61,217.28

Finding the Fourth Proportional to 85,128.48, 117,424.05 and 61,217.28

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Solution

The fourth proportional to 85,128.48, 117,424.05 and 61,217.28 is: 84,441.55

Step by Step Solution

  1. Step 1: Write the proportion equation
    85,128.48 : 117,424.05 = 61,217.28 : x
  2. Step 2: Convert to fraction form
    85,128.48/117,424.05 = 61,217.28/x
  3. Step 3: Cross multiply
    85,128.48x = 117,424.05 × 61,217.28
  4. Step 4: Simplify right side
    85,128.48x = 7,188,380,947.58
  5. Step 5: Solve for x
    x = 7,188,380,947.58/85,128.48
  6. Step 6: Final answer
    x = 84,441.55

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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.