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Finding the Fourth Proportional to 128,702.74, 192,976.06 and 57,612.28

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Solution

The fourth proportional to 128,702.74, 192,976.06 and 57,612.28 is: 86,383.48

Step by Step Solution

  1. Step 1: Write the proportion equation
    128,702.74 : 192,976.06 = 57,612.28 : x
  2. Step 2: Convert to fraction form
    128,702.74/192,976.06 = 57,612.28/x
  3. Step 3: Cross multiply
    128,702.74x = 192,976.06 × 57,612.28
  4. Step 4: Simplify right side
    128,702.74x = 11,117,790,802.02
  5. Step 5: Solve for x
    x = 11,117,790,802.02/128,702.74
  6. Step 6: Final answer
    x = 86,383.48

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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.