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Finding the Fourth Proportional to 28,978.48, 43,411.31 and 21,365.89

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Solution

The fourth proportional to 28,978.48, 43,411.31 and 21,365.89 is: 32,007.25

Step by Step Solution

  1. Step 1: Write the proportion equation
    28,978.48 : 43,411.31 = 21,365.89 : x
  2. Step 2: Convert to fraction form
    28,978.48/43,411.31 = 21,365.89/x
  3. Step 3: Cross multiply
    28,978.48x = 43,411.31 × 21,365.89
  4. Step 4: Simplify right side
    28,978.48x = 927,521,436.16
  5. Step 5: Solve for x
    x = 927,521,436.16/28,978.48
  6. Step 6: Final answer
    x = 32,007.25

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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.