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Finding the Fourth Proportional to 20,643, 28,476.92 and 12,139.71

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Solution

The fourth proportional to 20,643, 28,476.92 and 12,139.71 is: 16,746.67

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,643 : 28,476.92 = 12,139.71 : x
  2. Step 2: Convert to fraction form
    20,643/28,476.92 = 12,139.71/x
  3. Step 3: Cross multiply
    20,643x = 28,476.92 × 12,139.71
  4. Step 4: Simplify right side
    20,643x = 345,701,550.49
  5. Step 5: Solve for x
    x = 345,701,550.49/20,643
  6. Step 6: Final answer
    x = 16,746.67

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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.