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Finding the Fourth Proportional to 13,364.31, 18,440.65 and 7,699.31

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Solution

The fourth proportional to 13,364.31, 18,440.65 and 7,699.31 is: 10,623.84

Step by Step Solution

  1. Step 1: Write the proportion equation
    13,364.31 : 18,440.65 = 7,699.31 : x
  2. Step 2: Convert to fraction form
    13,364.31/18,440.65 = 7,699.31/x
  3. Step 3: Cross multiply
    13,364.31x = 18,440.65 × 7,699.31
  4. Step 4: Simplify right side
    13,364.31x = 141,980,280.95
  5. Step 5: Solve for x
    x = 141,980,280.95/13,364.31
  6. Step 6: Final answer
    x = 10,623.84

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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.