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Finding the Fourth Proportional to 86,685.80, 121,204.60 and 86,685.80

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Solution

The fourth proportional to 86,685.80, 121,204.60 and 86,685.80 is: 121,204.60

Step by Step Solution

  1. Step 1: Write the proportion equation
    86,685.80 : 121,204.60 = 86,685.80 : x
  2. Step 2: Convert to fraction form
    86,685.80/121,204.60 = 86,685.80/x
  3. Step 3: Cross multiply
    86,685.80x = 121,204.60 × 86,685.80
  4. Step 4: Simplify right side
    86,685.80x = 10,506,717,714.68
  5. Step 5: Solve for x
    x = 10,506,717,714.68/86,685.80
  6. Step 6: Final answer
    x = 121,204.60

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Why These Related Problems?

These problems maintain the same ratio (1.40) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.