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Finding the Fourth Proportional to 21,005.97, 28,988.90 and 12,055.11

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Solution

The fourth proportional to 21,005.97, 28,988.90 and 12,055.11 is: 16,636.43

Step by Step Solution

  1. Step 1: Write the proportion equation
    21,005.97 : 28,988.90 = 12,055.11 : x
  2. Step 2: Convert to fraction form
    21,005.97/28,988.90 = 12,055.11/x
  3. Step 3: Cross multiply
    21,005.97x = 28,988.90 × 12,055.11
  4. Step 4: Simplify right side
    21,005.97x = 349,464,378.28
  5. Step 5: Solve for x
    x = 349,464,378.28/21,005.97
  6. Step 6: Final answer
    x = 16,636.43

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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.