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Finding the Fourth Proportional to 20,628.76, 28,477.74 and 12,672.76

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Solution

The fourth proportional to 20,628.76, 28,477.74 and 12,672.76 is: 17,494.58

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,628.76 : 28,477.74 = 12,672.76 : x
  2. Step 2: Convert to fraction form
    20,628.76/28,477.74 = 12,672.76/x
  3. Step 3: Cross multiply
    20,628.76x = 28,477.74 × 12,672.76
  4. Step 4: Simplify right side
    20,628.76x = 360,891,564.36
  5. Step 5: Solve for x
    x = 360,891,564.36/20,628.76
  6. Step 6: Final answer
    x = 17,494.58

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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.