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Finding the Fourth Proportional to 18,639.97, 27,960.13 and 5,312.94

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Solution

The fourth proportional to 18,639.97, 27,960.13 and 5,312.94 is: 7,969.46

Step by Step Solution

  1. Step 1: Write the proportion equation
    18,639.97 : 27,960.13 = 5,312.94 : x
  2. Step 2: Convert to fraction form
    18,639.97/27,960.13 = 5,312.94/x
  3. Step 3: Cross multiply
    18,639.97x = 27,960.13 × 5,312.94
  4. Step 4: Simplify right side
    18,639.97x = 148,550,493.08
  5. Step 5: Solve for x
    x = 148,550,493.08/18,639.97
  6. Step 6: Final answer
    x = 7,969.46

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1.5x scale

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.