Home / 20,373.30-28,111.86-11,420.64

Finding the Fourth Proportional to 20,373.30, 28,111.86 and 11,420.64

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Solution

The fourth proportional to 20,373.30, 28,111.86 and 11,420.64 is: 15,758.64

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,373.30 : 28,111.86 = 11,420.64 : x
  2. Step 2: Convert to fraction form
    20,373.30/28,111.86 = 11,420.64/x
  3. Step 3: Cross multiply
    20,373.30x = 28,111.86 × 11,420.64
  4. Step 4: Simplify right side
    20,373.30x = 321,055,432.79
  5. Step 5: Solve for x
    x = 321,055,432.79/20,373.30
  6. Step 6: Final answer
    x = 15,758.64

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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.