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Finding the Fourth Proportional to 18,431.79, 25,430.02 and 10,880.72

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Solution

The fourth proportional to 18,431.79, 25,430.02 and 10,880.72 is: 15,011.94

Step by Step Solution

  1. Step 1: Write the proportion equation
    18,431.79 : 25,430.02 = 10,880.72 : x
  2. Step 2: Convert to fraction form
    18,431.79/25,430.02 = 10,880.72/x
  3. Step 3: Cross multiply
    18,431.79x = 25,430.02 × 10,880.72
  4. Step 4: Simplify right side
    18,431.79x = 276,696,927.21
  5. Step 5: Solve for x
    x = 276,696,927.21/18,431.79
  6. Step 6: Final answer
    x = 15,011.94

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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.