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Finding the Fourth Proportional to 18,753.19, 28,135.94 and 7,669.20

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Solution

The fourth proportional to 18,753.19, 28,135.94 and 7,669.20 is: 11,506.31

Step by Step Solution

  1. Step 1: Write the proportion equation
    18,753.19 : 28,135.94 = 7,669.20 : x
  2. Step 2: Convert to fraction form
    18,753.19/28,135.94 = 7,669.20/x
  3. Step 3: Cross multiply
    18,753.19x = 28,135.94 × 7,669.20
  4. Step 4: Simplify right side
    18,753.19x = 215,779,972.02
  5. Step 5: Solve for x
    x = 215,779,972.02/18,753.19
  6. Step 6: Final answer
    x = 11,506.31

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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.