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Finding the Fourth Proportional to 86,122.98, 118,714.41 and 78,891.30

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Solution

The fourth proportional to 86,122.98, 118,714.41 and 78,891.30 is: 108,746.05

Step by Step Solution

  1. Step 1: Write the proportion equation
    86,122.98 : 118,714.41 = 78,891.30 : x
  2. Step 2: Convert to fraction form
    86,122.98/118,714.41 = 78,891.30/x
  3. Step 3: Cross multiply
    86,122.98x = 118,714.41 × 78,891.30
  4. Step 4: Simplify right side
    86,122.98x = 9,365,534,133.63
  5. Step 5: Solve for x
    x = 9,365,534,133.63/86,122.98
  6. Step 6: Final answer
    x = 108,746.05

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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.