Home / 13,780.11-20,658.59-6,389.87

Finding the Fourth Proportional to 13,780.11, 20,658.59 and 6,389.87

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Solution

The fourth proportional to 13,780.11, 20,658.59 and 6,389.87 is: 9,579.44

Step by Step Solution

  1. Step 1: Write the proportion equation
    13,780.11 : 20,658.59 = 6,389.87 : x
  2. Step 2: Convert to fraction form
    13,780.11/20,658.59 = 6,389.87/x
  3. Step 3: Cross multiply
    13,780.11x = 20,658.59 × 6,389.87
  4. Step 4: Simplify right side
    13,780.11x = 132,005,672.53
  5. Step 5: Solve for x
    x = 132,005,672.53/13,780.11
  6. Step 6: Final answer
    x = 9,579.44

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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.