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Finding the Fourth Proportional to 28,978.73, 39,989.26 and 17,798.57

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Solution

The fourth proportional to 28,978.73, 39,989.26 and 17,798.57 is: 24,561.17

Step by Step Solution

  1. Step 1: Write the proportion equation
    28,978.73 : 39,989.26 = 17,798.57 : x
  2. Step 2: Convert to fraction form
    28,978.73/39,989.26 = 17,798.57/x
  3. Step 3: Cross multiply
    28,978.73x = 39,989.26 × 17,798.57
  4. Step 4: Simplify right side
    28,978.73x = 711,751,643.36
  5. Step 5: Solve for x
    x = 711,751,643.36/28,978.73
  6. Step 6: Final answer
    x = 24,561.17

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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.