Home / 20,580.72-28,402.70-12,621.86

Finding the Fourth Proportional to 20,580.72, 28,402.70 and 12,621.86

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Solution

The fourth proportional to 20,580.72, 28,402.70 and 12,621.86 is: 17,418.97

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,580.72 : 28,402.70 = 12,621.86 : x
  2. Step 2: Convert to fraction form
    20,580.72/28,402.70 = 12,621.86/x
  3. Step 3: Cross multiply
    20,580.72x = 28,402.70 × 12,621.86
  4. Step 4: Simplify right side
    20,580.72x = 358,494,875.41
  5. Step 5: Solve for x
    x = 358,494,875.41/20,580.72
  6. Step 6: Final answer
    x = 17,418.97

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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.