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Finding the Fourth Proportional to 28,427.58, 39,228.21 and 15,680.00

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Solution

The fourth proportional to 28,427.58, 39,228.21 and 15,680.00 is: 21,637.37

Step by Step Solution

  1. Step 1: Write the proportion equation
    28,427.58 : 39,228.21 = 15,680.00 : x
  2. Step 2: Convert to fraction form
    28,427.58/39,228.21 = 15,680.00/x
  3. Step 3: Cross multiply
    28,427.58x = 39,228.21 × 15,680.00
  4. Step 4: Simplify right side
    28,427.58x = 615,098,136.66
  5. Step 5: Solve for x
    x = 615,098,136.66/28,427.58
  6. Step 6: Final answer
    x = 21,637.37

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