Home / 20,821.36-28,733.56-12,861.76

Finding the Fourth Proportional to 20,821.36, 28,733.56 and 12,861.76

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Solution

The fourth proportional to 20,821.36, 28,733.56 and 12,861.76 is: 17,749.28

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,821.36 : 28,733.56 = 12,861.76 : x
  2. Step 2: Convert to fraction form
    20,821.36/28,733.56 = 12,861.76/x
  3. Step 3: Cross multiply
    20,821.36x = 28,733.56 × 12,861.76
  4. Step 4: Simplify right side
    20,821.36x = 369,564,152.67
  5. Step 5: Solve for x
    x = 369,564,152.67/20,821.36
  6. Step 6: Final answer
    x = 17,749.28

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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.