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Finding the Fourth Proportional to 9,321.48, 12,806.10 and 8,339.76

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Solution

The fourth proportional to 9,321.48, 12,806.10 and 8,339.76 is: 11,457.39

Step by Step Solution

  1. Step 1: Write the proportion equation
    9,321.48 : 12,806.10 = 8,339.76 : x
  2. Step 2: Convert to fraction form
    9,321.48/12,806.10 = 8,339.76/x
  3. Step 3: Cross multiply
    9,321.48x = 12,806.10 × 8,339.76
  4. Step 4: Simplify right side
    9,321.48x = 106,799,800.54
  5. Step 5: Solve for x
    x = 106,799,800.54/9,321.48
  6. Step 6: Final answer
    x = 11,457.39

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Double scale
Find fourth proportional to 9,322.48, 12,807.47 and 8,340.76
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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.37) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.