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Finding the Fourth Proportional to 13,759.81, 18,988.76 and 7,791.32

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Solution

The fourth proportional to 13,759.81, 18,988.76 and 7,791.32 is: 10,752.15

Step by Step Solution

  1. Step 1: Write the proportion equation
    13,759.81 : 18,988.76 = 7,791.32 : x
  2. Step 2: Convert to fraction form
    13,759.81/18,988.76 = 7,791.32/x
  3. Step 3: Cross multiply
    13,759.81x = 18,988.76 × 7,791.32
  4. Step 4: Simplify right side
    13,759.81x = 147,947,466.61
  5. Step 5: Solve for x
    x = 147,947,466.61/13,759.81
  6. Step 6: Final answer
    x = 10,752.15

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1.5x scale

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.