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Finding the Fourth Proportional to 128,390.02, 192,667.64 and 69,266.50

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Solution

The fourth proportional to 128,390.02, 192,667.64 and 69,266.50 is: 103,944.32

Step by Step Solution

  1. Step 1: Write the proportion equation
    128,390.02 : 192,667.64 = 69,266.50 : x
  2. Step 2: Convert to fraction form
    128,390.02/192,667.64 = 69,266.50/x
  3. Step 3: Cross multiply
    128,390.02x = 192,667.64 × 69,266.50
  4. Step 4: Simplify right side
    128,390.02x = 13,345,413,086.06
  5. Step 5: Solve for x
    x = 13,345,413,086.06/128,390.02
  6. Step 6: Final answer
    x = 103,944.32

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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.