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Finding the Fourth Proportional to 21,959.80, 30,302.60 and 13,005.80

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Solution

The fourth proportional to 21,959.80, 30,302.60 and 13,005.80 is: 17,946.86

Step by Step Solution

  1. Step 1: Write the proportion equation
    21,959.80 : 30,302.60 = 13,005.80 : x
  2. Step 2: Convert to fraction form
    21,959.80/30,302.60 = 13,005.80/x
  3. Step 3: Cross multiply
    21,959.80x = 30,302.60 × 13,005.80
  4. Step 4: Simplify right side
    21,959.80x = 394,109,555.08
  5. Step 5: Solve for x
    x = 394,109,555.08/21,959.80
  6. Step 6: Final answer
    x = 17,946.86

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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.