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Finding the Fourth Proportional to 21,005.35, 28,986.02 and 11,573.91

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Solution

The fourth proportional to 21,005.35, 28,986.02 and 11,573.91 is: 15,971.25

Step by Step Solution

  1. Step 1: Write the proportion equation
    21,005.35 : 28,986.02 = 11,573.91 : x
  2. Step 2: Convert to fraction form
    21,005.35/28,986.02 = 11,573.91/x
  3. Step 3: Cross multiply
    21,005.35x = 28,986.02 × 11,573.91
  4. Step 4: Simplify right side
    21,005.35x = 335,481,572.27
  5. Step 5: Solve for x
    x = 335,481,572.27/21,005.35
  6. Step 6: Final answer
    x = 15,971.25

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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.