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Finding the Fourth Proportional to 21,959.73, 30,302.50 and 13,005.79

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Solution

The fourth proportional to 21,959.73, 30,302.50 and 13,005.79 is: 17,946.85

Step by Step Solution

  1. Step 1: Write the proportion equation
    21,959.73 : 30,302.50 = 13,005.79 : x
  2. Step 2: Convert to fraction form
    21,959.73/30,302.50 = 13,005.79/x
  3. Step 3: Cross multiply
    21,959.73x = 30,302.50 × 13,005.79
  4. Step 4: Simplify right side
    21,959.73x = 394,107,951.48
  5. Step 5: Solve for x
    x = 394,107,951.48/21,959.73
  6. Step 6: Final answer
    x = 17,946.85

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1.5x scale

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.