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Finding the Fourth Proportional to 18,963.81, 28,448.79 and 7,118.51

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Solution

The fourth proportional to 18,963.81, 28,448.79 and 7,118.51 is: 10,678.92

Step by Step Solution

  1. Step 1: Write the proportion equation
    18,963.81 : 28,448.79 = 7,118.51 : x
  2. Step 2: Convert to fraction form
    18,963.81/28,448.79 = 7,118.51/x
  3. Step 3: Cross multiply
    18,963.81x = 28,448.79 × 7,118.51
  4. Step 4: Simplify right side
    18,963.81x = 202,512,996.10
  5. Step 5: Solve for x
    x = 202,512,996.10/18,963.81
  6. Step 6: Final answer
    x = 10,678.92

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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.