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Finding the Fourth Proportional to 18,780.52, 28,165.98 and 7,685.14

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Solution

The fourth proportional to 18,780.52, 28,165.98 and 7,685.14 is: 11,525.75

Step by Step Solution

  1. Step 1: Write the proportion equation
    18,780.52 : 28,165.98 = 7,685.14 : x
  2. Step 2: Convert to fraction form
    18,780.52/28,165.98 = 7,685.14/x
  3. Step 3: Cross multiply
    18,780.52x = 28,165.98 × 7,685.14
  4. Step 4: Simplify right side
    18,780.52x = 216,459,499.54
  5. Step 5: Solve for x
    x = 216,459,499.54/18,780.52
  6. Step 6: Final answer
    x = 11,525.75

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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.