Home / 20,810.76-28,716.56-12,313.20

Finding the Fourth Proportional to 20,810.76, 28,716.56 and 12,313.20

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Solution

The fourth proportional to 20,810.76, 28,716.56 and 12,313.20 is: 16,990.86

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,810.76 : 28,716.56 = 12,313.20 : x
  2. Step 2: Convert to fraction form
    20,810.76/28,716.56 = 12,313.20/x
  3. Step 3: Cross multiply
    20,810.76x = 28,716.56 × 12,313.20
  4. Step 4: Simplify right side
    20,810.76x = 353,592,746.59
  5. Step 5: Solve for x
    x = 353,592,746.59/20,810.76
  6. Step 6: Final answer
    x = 16,990.86

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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.