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Finding the Fourth Proportional to 18,661.86, 25,751.45 and 11,490.63

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Solution

The fourth proportional to 18,661.86, 25,751.45 and 11,490.63 is: 15,855.89

Step by Step Solution

  1. Step 1: Write the proportion equation
    18,661.86 : 25,751.45 = 11,490.63 : x
  2. Step 2: Convert to fraction form
    18,661.86/25,751.45 = 11,490.63/x
  3. Step 3: Cross multiply
    18,661.86x = 25,751.45 × 11,490.63
  4. Step 4: Simplify right side
    18,661.86x = 295,900,326.46
  5. Step 5: Solve for x
    x = 295,900,326.46/18,661.86
  6. Step 6: Final answer
    x = 15,855.89

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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.