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Finding the Fourth Proportional to 86,905.90, 121,930.70 and 86,905.90

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Solution

The fourth proportional to 86,905.90, 121,930.70 and 86,905.90 is: 121,930.70

Step by Step Solution

  1. Step 1: Write the proportion equation
    86,905.90 : 121,930.70 = 86,905.90 : x
  2. Step 2: Convert to fraction form
    86,905.90/121,930.70 = 86,905.90/x
  3. Step 3: Cross multiply
    86,905.90x = 121,930.70 × 86,905.90
  4. Step 4: Simplify right side
    86,905.90x = 10,596,497,221.13
  5. Step 5: Solve for x
    x = 10,596,497,221.13/86,905.90
  6. Step 6: Final answer
    x = 121,930.70

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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.