Home / 20,555.10-28,359.11-13,381.74

Finding the Fourth Proportional to 20,555.10, 28,359.11 and 13,381.74

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Solution

The fourth proportional to 20,555.10, 28,359.11 and 13,381.74 is: 18,462.29

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,555.10 : 28,359.11 = 13,381.74 : x
  2. Step 2: Convert to fraction form
    20,555.10/28,359.11 = 13,381.74/x
  3. Step 3: Cross multiply
    20,555.10x = 28,359.11 × 13,381.74
  4. Step 4: Simplify right side
    20,555.10x = 379,494,270.11
  5. Step 5: Solve for x
    x = 379,494,270.11/20,555.10
  6. Step 6: Final answer
    x = 18,462.29

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1.5x scale

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.