Home / 20,687.86-28,548.93-11,256.40

Finding the Fourth Proportional to 20,687.86, 28,548.93 and 11,256.40

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Solution

The fourth proportional to 20,687.86, 28,548.93 and 11,256.40 is: 15,533.66

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,687.86 : 28,548.93 = 11,256.40 : x
  2. Step 2: Convert to fraction form
    20,687.86/28,548.93 = 11,256.40/x
  3. Step 3: Cross multiply
    20,687.86x = 28,548.93 × 11,256.40
  4. Step 4: Simplify right side
    20,687.86x = 321,358,175.65
  5. Step 5: Solve for x
    x = 321,358,175.65/20,687.86
  6. Step 6: Final answer
    x = 15,533.66

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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.