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Finding the Fourth Proportional to 12,123.84, 16,731.72 and 6,818.40

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Solution

The fourth proportional to 12,123.84, 16,731.72 and 6,818.40 is: 9,409.85

Step by Step Solution

  1. Step 1: Write the proportion equation
    12,123.84 : 16,731.72 = 6,818.40 : x
  2. Step 2: Convert to fraction form
    12,123.84/16,731.72 = 6,818.40/x
  3. Step 3: Cross multiply
    12,123.84x = 16,731.72 × 6,818.40
  4. Step 4: Simplify right side
    12,123.84x = 114,083,559.65
  5. Step 5: Solve for x
    x = 114,083,559.65/12,123.84
  6. Step 6: Final answer
    x = 9,409.85

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Double scale
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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.