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Finding the Fourth Proportional to 21,957, 30,300.66 and 12,525.60

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Solution

The fourth proportional to 21,957, 30,300.66 and 12,525.60 is: 17,285.33

Step by Step Solution

  1. Step 1: Write the proportion equation
    21,957 : 30,300.66 = 12,525.60 : x
  2. Step 2: Convert to fraction form
    21,957/30,300.66 = 12,525.60/x
  3. Step 3: Cross multiply
    21,957x = 30,300.66 × 12,525.60
  4. Step 4: Simplify right side
    21,957x = 379,533,946.90
  5. Step 5: Solve for x
    x = 379,533,946.90/21,957
  6. Step 6: Final answer
    x = 17,285.33

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.