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Finding the Fourth Proportional to 86,638.60, 129,957.90 and 86,638.60

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Solution

The fourth proportional to 86,638.60, 129,957.90 and 86,638.60 is: 129,957.90

Step by Step Solution

  1. Step 1: Write the proportion equation
    86,638.60 : 129,957.90 = 86,638.60 : x
  2. Step 2: Convert to fraction form
    86,638.60/129,957.90 = 86,638.60/x
  3. Step 3: Cross multiply
    86,638.60x = 129,957.90 × 86,638.60
  4. Step 4: Simplify right side
    86,638.60x = 11,259,370,514.94
  5. Step 5: Solve for x
    x = 11,259,370,514.94/86,638.60
  6. Step 6: Final answer
    x = 129,957.90

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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.