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Finding the Fourth Proportional to 19,209.76, 28,664.40 and 15,215.76

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Solution

The fourth proportional to 19,209.76, 28,664.40 and 15,215.76 is: 22,704.64

Step by Step Solution

  1. Step 1: Write the proportion equation
    19,209.76 : 28,664.40 = 15,215.76 : x
  2. Step 2: Convert to fraction form
    19,209.76/28,664.40 = 15,215.76/x
  3. Step 3: Cross multiply
    19,209.76x = 28,664.40 × 15,215.76
  4. Step 4: Simplify right side
    19,209.76x = 436,150,630.94
  5. Step 5: Solve for x
    x = 436,150,630.94/19,209.76
  6. Step 6: Final answer
    x = 22,704.64

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.49) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.