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Finding the Fourth Proportional to 86,009.60, 128,971.20 and 39,209.60

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Solution

The fourth proportional to 86,009.60, 128,971.20 and 39,209.60 is: 58,794.71

Step by Step Solution

  1. Step 1: Write the proportion equation
    86,009.60 : 128,971.20 = 39,209.60 : x
  2. Step 2: Convert to fraction form
    86,009.60/128,971.20 = 39,209.60/x
  3. Step 3: Cross multiply
    86,009.60x = 128,971.20 × 39,209.60
  4. Step 4: Simplify right side
    86,009.60x = 5,056,909,163.52
  5. Step 5: Solve for x
    x = 5,056,909,163.52/86,009.60
  6. Step 6: Final answer
    x = 58,794.71

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1.5x scale

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.