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Finding the Fourth Proportional to 12,916.40, 19,376.40 and 5,520.80

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Solution

The fourth proportional to 12,916.40, 19,376.40 and 5,520.80 is: 8,281.97

Step by Step Solution

  1. Step 1: Write the proportion equation
    12,916.40 : 19,376.40 = 5,520.80 : x
  2. Step 2: Convert to fraction form
    12,916.40/19,376.40 = 5,520.80/x
  3. Step 3: Cross multiply
    12,916.40x = 19,376.40 × 5,520.80
  4. Step 4: Simplify right side
    12,916.40x = 106,973,229.12
  5. Step 5: Solve for x
    x = 106,973,229.12/12,916.40
  6. Step 6: Final answer
    x = 8,281.97

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.