Home / 20,645.40-28,490.64-11,213.94

Finding the Fourth Proportional to 20,645.40, 28,490.64 and 11,213.94

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Solution

The fourth proportional to 20,645.40, 28,490.64 and 11,213.94 is: 15,475.23

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,645.40 : 28,490.64 = 11,213.94 : x
  2. Step 2: Convert to fraction form
    20,645.40/28,490.64 = 11,213.94/x
  3. Step 3: Cross multiply
    20,645.40x = 28,490.64 × 11,213.94
  4. Step 4: Simplify right side
    20,645.40x = 319,492,327.52
  5. Step 5: Solve for x
    x = 319,492,327.52/20,645.40
  6. Step 6: Final answer
    x = 15,475.23

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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.