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Finding the Fourth Proportional to 28,055.25, 38,716.25 and 15,480

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Solution

The fourth proportional to 28,055.25, 38,716.25 and 15,480 is: 21,362.40

Step by Step Solution

  1. Step 1: Write the proportion equation
    28,055.25 : 38,716.25 = 15,480 : x
  2. Step 2: Convert to fraction form
    28,055.25/38,716.25 = 15,480/x
  3. Step 3: Cross multiply
    28,055.25x = 38,716.25 × 15,480
  4. Step 4: Simplify right side
    28,055.25x = 599,327,472.60
  5. Step 5: Solve for x
    x = 599,327,472.60/28,055.25
  6. Step 6: Final answer
    x = 21,362.40

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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.