Home / 20,881.56-28,820.74-12,388.40

Finding the Fourth Proportional to 20,881.56, 28,820.74 and 12,388.40

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Solution

The fourth proportional to 20,881.56, 28,820.74 and 12,388.40 is: 17,098.47

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,881.56 : 28,820.74 = 12,388.40 : x
  2. Step 2: Convert to fraction form
    20,881.56/28,820.74 = 12,388.40/x
  3. Step 3: Cross multiply
    20,881.56x = 28,820.74 × 12,388.40
  4. Step 4: Simplify right side
    20,881.56x = 357,042,798.85
  5. Step 5: Solve for x
    x = 357,042,798.85/20,881.56
  6. Step 6: Final answer
    x = 17,098.47

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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.