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Finding the Fourth Proportional to 28,978.61, 43,489.80 and 21,207.47

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Solution

The fourth proportional to 28,978.61, 43,489.80 and 21,207.47 is: 31,827.22

Step by Step Solution

  1. Step 1: Write the proportion equation
    28,978.61 : 43,489.80 = 21,207.47 : x
  2. Step 2: Convert to fraction form
    28,978.61/43,489.80 = 21,207.47/x
  3. Step 3: Cross multiply
    28,978.61x = 43,489.80 × 21,207.47
  4. Step 4: Simplify right side
    28,978.61x = 922,308,411.36
  5. Step 5: Solve for x
    x = 922,308,411.36/28,978.61
  6. Step 6: Final answer
    x = 31,827.22

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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.