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Finding the Fourth Proportional to 13,164.01, 18,172.31 and 8,390.51

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Solution

The fourth proportional to 13,164.01, 18,172.31 and 8,390.51 is: 11,582.71

Step by Step Solution

  1. Step 1: Write the proportion equation
    13,164.01 : 18,172.31 = 8,390.51 : x
  2. Step 2: Convert to fraction form
    13,164.01/18,172.31 = 8,390.51/x
  3. Step 3: Cross multiply
    13,164.01x = 18,172.31 × 8,390.51
  4. Step 4: Simplify right side
    13,164.01x = 152,474,948.78
  5. Step 5: Solve for x
    x = 152,474,948.78/13,164.01
  6. Step 6: Final answer
    x = 11,582.71

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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.