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Finding the Fourth Proportional to 128,530.52, 192,835.19 and 57,512.94

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Solution

The fourth proportional to 128,530.52, 192,835.19 and 57,512.94 is: 86,287.04

Step by Step Solution

  1. Step 1: Write the proportion equation
    128,530.52 : 192,835.19 = 57,512.94 : x
  2. Step 2: Convert to fraction form
    128,530.52/192,835.19 = 57,512.94/x
  3. Step 3: Cross multiply
    128,530.52x = 192,835.19 × 57,512.94
  4. Step 4: Simplify right side
    128,530.52x = 11,090,518,712.36
  5. Step 5: Solve for x
    x = 11,090,518,712.36/128,530.52
  6. Step 6: Final answer
    x = 86,287.04

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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.