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Finding the Fourth Proportional to 18,860.80, 28,270.54 and 9,485.86

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Solution

The fourth proportional to 18,860.80, 28,270.54 and 9,485.86 is: 14,218.40

Step by Step Solution

  1. Step 1: Write the proportion equation
    18,860.80 : 28,270.54 = 9,485.86 : x
  2. Step 2: Convert to fraction form
    18,860.80/28,270.54 = 9,485.86/x
  3. Step 3: Cross multiply
    18,860.80x = 28,270.54 × 9,485.86
  4. Step 4: Simplify right side
    18,860.80x = 268,170,384.56
  5. Step 5: Solve for x
    x = 268,170,384.56/18,860.80
  6. Step 6: Final answer
    x = 14,218.40

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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.