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Finding the Fourth Proportional to 18,935.10, 28,400.70 and 8,405.31

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Solution

The fourth proportional to 18,935.10, 28,400.70 and 8,405.31 is: 12,607.10

Step by Step Solution

  1. Step 1: Write the proportion equation
    18,935.10 : 28,400.70 = 8,405.31 : x
  2. Step 2: Convert to fraction form
    18,935.10/28,400.70 = 8,405.31/x
  3. Step 3: Cross multiply
    18,935.10x = 28,400.70 × 8,405.31
  4. Step 4: Simplify right side
    18,935.10x = 238,716,687.72
  5. Step 5: Solve for x
    x = 238,716,687.72/18,935.10
  6. Step 6: Final answer
    x = 12,607.10

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.