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Finding the Fourth Proportional to 19,656.80, 29,485.20 and 18,879.20

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Solution

The fourth proportional to 19,656.80, 29,485.20 and 18,879.20 is: 28,318.80

Step by Step Solution

  1. Step 1: Write the proportion equation
    19,656.80 : 29,485.20 = 18,879.20 : x
  2. Step 2: Convert to fraction form
    19,656.80/29,485.20 = 18,879.20/x
  3. Step 3: Cross multiply
    19,656.80x = 29,485.20 × 18,879.20
  4. Step 4: Simplify right side
    19,656.80x = 556,656,987.84
  5. Step 5: Solve for x
    x = 556,656,987.84/19,656.80
  6. Step 6: Final answer
    x = 28,318.80

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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.