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Finding the Fourth Proportional to 28,978.48, 40,008.90 and 19,918.90

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Solution

The fourth proportional to 28,978.48, 40,008.90 and 19,918.90 is: 27,500.87

Step by Step Solution

  1. Step 1: Write the proportion equation
    28,978.48 : 40,008.90 = 19,918.90 : x
  2. Step 2: Convert to fraction form
    28,978.48/40,008.90 = 19,918.90/x
  3. Step 3: Cross multiply
    28,978.48x = 40,008.90 × 19,918.90
  4. Step 4: Simplify right side
    28,978.48x = 796,933,278.21
  5. Step 5: Solve for x
    x = 796,933,278.21/28,978.48
  6. Step 6: Final answer
    x = 27,500.87

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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.