Home / 20,776.86-28,665.32-12,279.24

Finding the Fourth Proportional to 20,776.86, 28,665.32 and 12,279.24

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Solution

The fourth proportional to 20,776.86, 28,665.32 and 12,279.24 is: 16,941.36

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,776.86 : 28,665.32 = 12,279.24 : x
  2. Step 2: Convert to fraction form
    20,776.86/28,665.32 = 12,279.24/x
  3. Step 3: Cross multiply
    20,776.86x = 28,665.32 × 12,279.24
  4. Step 4: Simplify right side
    20,776.86x = 351,988,343.96
  5. Step 5: Solve for x
    x = 351,988,343.96/20,776.86
  6. Step 6: Final answer
    x = 16,941.36

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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.