Home / 20,454.78-28,228.95-11,381.43

Finding the Fourth Proportional to 20,454.78, 28,228.95 and 11,381.43

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Solution

The fourth proportional to 20,454.78, 28,228.95 and 11,381.43 is: 15,707.13

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,454.78 : 28,228.95 = 11,381.43 : x
  2. Step 2: Convert to fraction form
    20,454.78/28,228.95 = 11,381.43/x
  3. Step 3: Cross multiply
    20,454.78x = 28,228.95 × 11,381.43
  4. Step 4: Simplify right side
    20,454.78x = 321,285,818.40
  5. Step 5: Solve for x
    x = 321,285,818.40/20,454.78
  6. Step 6: Final answer
    x = 15,707.13

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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.