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Finding the Fourth Proportional to 18,783.12, 28,149.80 and 9,999.12

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Solution

The fourth proportional to 18,783.12, 28,149.80 and 9,999.12 is: 14,985.44

Step by Step Solution

  1. Step 1: Write the proportion equation
    18,783.12 : 28,149.80 = 9,999.12 : x
  2. Step 2: Convert to fraction form
    18,783.12/28,149.80 = 9,999.12/x
  3. Step 3: Cross multiply
    18,783.12x = 28,149.80 × 9,999.12
  4. Step 4: Simplify right side
    18,783.12x = 281,473,228.18
  5. Step 5: Solve for x
    x = 281,473,228.18/18,783.12
  6. Step 6: Final answer
    x = 14,985.44

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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.