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Finding the Fourth Proportional to 20,955.57, 28,925.48 and 13,422.18

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Solution

The fourth proportional to 20,955.57, 28,925.48 and 13,422.18 is: 18,526.96

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,955.57 : 28,925.48 = 13,422.18 : x
  2. Step 2: Convert to fraction form
    20,955.57/28,925.48 = 13,422.18/x
  3. Step 3: Cross multiply
    20,955.57x = 28,925.48 × 13,422.18
  4. Step 4: Simplify right side
    20,955.57x = 388,242,932.04
  5. Step 5: Solve for x
    x = 388,242,932.04/20,955.57
  6. Step 6: Final answer
    x = 18,526.96

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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.