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Finding the Fourth Proportional to 28,456.81, 39,281.16 and 21,403.60

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Solution

The fourth proportional to 28,456.81, 39,281.16 and 21,403.60 is: 29,545.06

Step by Step Solution

  1. Step 1: Write the proportion equation
    28,456.81 : 39,281.16 = 21,403.60 : x
  2. Step 2: Convert to fraction form
    28,456.81/39,281.16 = 21,403.60/x
  3. Step 3: Cross multiply
    28,456.81x = 39,281.16 × 21,403.60
  4. Step 4: Simplify right side
    28,456.81x = 840,758,236.18
  5. Step 5: Solve for x
    x = 840,758,236.18/28,456.81
  6. Step 6: Final answer
    x = 29,545.06

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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.