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Finding the Fourth Proportional to 20,765.15, 28,655.01 and 12,270

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Solution

The fourth proportional to 20,765.15, 28,655.01 and 12,270 is: 16,932.07

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,765.15 : 28,655.01 = 12,270 : x
  2. Step 2: Convert to fraction form
    20,765.15/28,655.01 = 12,270/x
  3. Step 3: Cross multiply
    20,765.15x = 28,655.01 × 12,270
  4. Step 4: Simplify right side
    20,765.15x = 351,596,972.70
  5. Step 5: Solve for x
    x = 351,596,972.70/20,765.15
  6. Step 6: Final answer
    x = 16,932.07

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.