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Finding the Fourth Proportional to 28,980.80, 43,485.60 and 11,451.20

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Solution

The fourth proportional to 28,980.80, 43,485.60 and 11,451.20 is: 17,182.49

Step by Step Solution

  1. Step 1: Write the proportion equation
    28,980.80 : 43,485.60 = 11,451.20 : x
  2. Step 2: Convert to fraction form
    28,980.80/43,485.60 = 11,451.20/x
  3. Step 3: Cross multiply
    28,980.80x = 43,485.60 × 11,451.20
  4. Step 4: Simplify right side
    28,980.80x = 497,962,302.72
  5. Step 5: Solve for x
    x = 497,962,302.72/28,980.80
  6. Step 6: Final answer
    x = 17,182.49

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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.