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Finding the Fourth Proportional to 28,740.80, 43,111.20 and 19,992.80

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Solution

The fourth proportional to 28,740.80, 43,111.20 and 19,992.80 is: 29,989.20

Step by Step Solution

  1. Step 1: Write the proportion equation
    28,740.80 : 43,111.20 = 19,992.80 : x
  2. Step 2: Convert to fraction form
    28,740.80/43,111.20 = 19,992.80/x
  3. Step 3: Cross multiply
    28,740.80x = 43,111.20 × 19,992.80
  4. Step 4: Simplify right side
    28,740.80x = 861,913,599.36
  5. Step 5: Solve for x
    x = 861,913,599.36/28,740.80
  6. Step 6: Final answer
    x = 29,989.20

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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.