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Finding the Fourth Proportional to 20,700.63, 28,571.40 and 12,636

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Solution

The fourth proportional to 20,700.63, 28,571.40 and 12,636 is: 17,440.45

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,700.63 : 28,571.40 = 12,636 : x
  2. Step 2: Convert to fraction form
    20,700.63/28,571.40 = 12,636/x
  3. Step 3: Cross multiply
    20,700.63x = 28,571.40 × 12,636
  4. Step 4: Simplify right side
    20,700.63x = 361,028,210.40
  5. Step 5: Solve for x
    x = 361,028,210.40/20,700.63
  6. Step 6: Final answer
    x = 17,440.45

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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.