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Finding the Fourth Proportional to 18,985.92, 28,504.80 and 12,091.20

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Solution

The fourth proportional to 18,985.92, 28,504.80 and 12,091.20 is: 18,153.31

Step by Step Solution

  1. Step 1: Write the proportion equation
    18,985.92 : 28,504.80 = 12,091.20 : x
  2. Step 2: Convert to fraction form
    18,985.92/28,504.80 = 12,091.20/x
  3. Step 3: Cross multiply
    18,985.92x = 28,504.80 × 12,091.20
  4. Step 4: Simplify right side
    18,985.92x = 344,657,237.76
  5. Step 5: Solve for x
    x = 344,657,237.76/18,985.92
  6. Step 6: Final answer
    x = 18,153.31

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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.