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Finding the Fourth Proportional to 86,904.10, 121,840.70 and 86,904.10

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Solution

The fourth proportional to 86,904.10, 121,840.70 and 86,904.10 is: 121,840.70

Step by Step Solution

  1. Step 1: Write the proportion equation
    86,904.10 : 121,840.70 = 86,904.10 : x
  2. Step 2: Convert to fraction form
    86,904.10/121,840.70 = 86,904.10/x
  3. Step 3: Cross multiply
    86,904.10x = 121,840.70 × 86,904.10
  4. Step 4: Simplify right side
    86,904.10x = 10,588,456,376.87
  5. Step 5: Solve for x
    x = 10,588,456,376.87/86,904.10
  6. Step 6: Final answer
    x = 121,840.70

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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.