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Finding the Fourth Proportional to 20,932, 28,885.88 and 11,500.40

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Solution

The fourth proportional to 20,932, 28,885.88 and 11,500.40 is: 15,870.40

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,932 : 28,885.88 = 11,500.40 : x
  2. Step 2: Convert to fraction form
    20,932/28,885.88 = 11,500.40/x
  3. Step 3: Cross multiply
    20,932x = 28,885.88 × 11,500.40
  4. Step 4: Simplify right side
    20,932x = 332,199,174.35
  5. Step 5: Solve for x
    x = 332,199,174.35/20,932
  6. Step 6: Final answer
    x = 15,870.40

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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.