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Finding the Fourth Proportional to 18,666.90, 25,758 and 12,630.33

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Solution

The fourth proportional to 18,666.90, 25,758 and 12,630.33 is: 17,428.28

Step by Step Solution

  1. Step 1: Write the proportion equation
    18,666.90 : 25,758 = 12,630.33 : x
  2. Step 2: Convert to fraction form
    18,666.90/25,758 = 12,630.33/x
  3. Step 3: Cross multiply
    18,666.90x = 25,758 × 12,630.33
  4. Step 4: Simplify right side
    18,666.90x = 325,332,040.14
  5. Step 5: Solve for x
    x = 325,332,040.14/18,666.90
  6. Step 6: Final answer
    x = 17,428.28

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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.