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Finding the Fourth Proportional to 128,980.08, 193,525.80 and 69,858

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Solution

The fourth proportional to 128,980.08, 193,525.80 and 69,858 is: 104,817.16

Step by Step Solution

  1. Step 1: Write the proportion equation
    128,980.08 : 193,525.80 = 69,858 : x
  2. Step 2: Convert to fraction form
    128,980.08/193,525.80 = 69,858/x
  3. Step 3: Cross multiply
    128,980.08x = 193,525.80 × 69,858
  4. Step 4: Simplify right side
    128,980.08x = 13,519,325,336.40
  5. Step 5: Solve for x
    x = 13,519,325,336.40/128,980.08
  6. Step 6: Final answer
    x = 104,817.16

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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.