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Finding the Fourth Proportional to 28,999.76, 40,000.92 and 19,920.80

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Solution

The fourth proportional to 28,999.76, 40,000.92 and 19,920.80 is: 27,477.82

Step by Step Solution

  1. Step 1: Write the proportion equation
    28,999.76 : 40,000.92 = 19,920.80 : x
  2. Step 2: Convert to fraction form
    28,999.76/40,000.92 = 19,920.80/x
  3. Step 3: Cross multiply
    28,999.76x = 40,000.92 × 19,920.80
  4. Step 4: Simplify right side
    28,999.76x = 796,850,327.14
  5. Step 5: Solve for x
    x = 796,850,327.14/28,999.76
  6. Step 6: Final answer
    x = 27,477.82

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.