Home / 20,475.76-28,249.32-13,406.08

Finding the Fourth Proportional to 20,475.76, 28,249.32 and 13,406.08

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Solution

The fourth proportional to 20,475.76, 28,249.32 and 13,406.08 is: 18,495.66

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,475.76 : 28,249.32 = 13,406.08 : x
  2. Step 2: Convert to fraction form
    20,475.76/28,249.32 = 13,406.08/x
  3. Step 3: Cross multiply
    20,475.76x = 28,249.32 × 13,406.08
  4. Step 4: Simplify right side
    20,475.76x = 378,712,643.87
  5. Step 5: Solve for x
    x = 378,712,643.87/20,475.76
  6. Step 6: Final answer
    x = 18,495.66

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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.