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Finding the Fourth Proportional to 19,896.80, 29,866.80 and 12,509.60

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Solution

The fourth proportional to 19,896.80, 29,866.80 and 12,509.60 is: 18,777.98

Step by Step Solution

  1. Step 1: Write the proportion equation
    19,896.80 : 29,866.80 = 12,509.60 : x
  2. Step 2: Convert to fraction form
    19,896.80/29,866.80 = 12,509.60/x
  3. Step 3: Cross multiply
    19,896.80x = 29,866.80 × 12,509.60
  4. Step 4: Simplify right side
    19,896.80x = 373,621,721.28
  5. Step 5: Solve for x
    x = 373,621,721.28/19,896.80
  6. Step 6: Final answer
    x = 18,777.98

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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.