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Finding the Fourth Proportional to 20,995, 28,970.58 and 12,042.04

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Solution

The fourth proportional to 20,995, 28,970.58 and 12,042.04 is: 16,616.57

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,995 : 28,970.58 = 12,042.04 : x
  2. Step 2: Convert to fraction form
    20,995/28,970.58 = 12,042.04/x
  3. Step 3: Cross multiply
    20,995x = 28,970.58 × 12,042.04
  4. Step 4: Simplify right side
    20,995x = 348,864,883.18
  5. Step 5: Solve for x
    x = 348,864,883.18/20,995
  6. Step 6: Final answer
    x = 16,616.57

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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.