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Finding the Fourth Proportional to 86,128.45, 118,842.86 and 47,886.93

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Solution

The fourth proportional to 86,128.45, 118,842.86 and 47,886.93 is: 66,075.96

Step by Step Solution

  1. Step 1: Write the proportion equation
    86,128.45 : 118,842.86 = 47,886.93 : x
  2. Step 2: Convert to fraction form
    86,128.45/118,842.86 = 47,886.93/x
  3. Step 3: Cross multiply
    86,128.45x = 118,842.86 × 47,886.93
  4. Step 4: Simplify right side
    86,128.45x = 5,691,019,837.54
  5. Step 5: Solve for x
    x = 5,691,019,837.54/86,128.45
  6. Step 6: Final answer
    x = 66,075.96

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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.