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Finding the Fourth Proportional to 19,488.80, 29,247.60 and 12,912.80

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Solution

The fourth proportional to 19,488.80, 29,247.60 and 12,912.80 is: 19,378.74

Step by Step Solution

  1. Step 1: Write the proportion equation
    19,488.80 : 29,247.60 = 12,912.80 : x
  2. Step 2: Convert to fraction form
    19,488.80/29,247.60 = 12,912.80/x
  3. Step 3: Cross multiply
    19,488.80x = 29,247.60 × 12,912.80
  4. Step 4: Simplify right side
    19,488.80x = 377,668,409.28
  5. Step 5: Solve for x
    x = 377,668,409.28/19,488.80
  6. Step 6: Final answer
    x = 19,378.74

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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.