Home / 20,587.80-30,883.86-12,790.20

Finding the Fourth Proportional to 20,587.80, 30,883.86 and 12,790.20

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Solution

The fourth proportional to 20,587.80, 30,883.86 and 12,790.20 is: 19,186.64

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,587.80 : 30,883.86 = 12,790.20 : x
  2. Step 2: Convert to fraction form
    20,587.80/30,883.86 = 12,790.20/x
  3. Step 3: Cross multiply
    20,587.80x = 30,883.86 × 12,790.20
  4. Step 4: Simplify right side
    20,587.80x = 395,010,746.17
  5. Step 5: Solve for x
    x = 395,010,746.17/20,587.80
  6. Step 6: Final answer
    x = 19,186.64

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.