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Finding the Fourth Proportional to 20,918, 31,491.12 and 19,080.88

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Solution

The fourth proportional to 20,918, 31,491.12 and 19,080.88 is: 28,725.42

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,918 : 31,491.12 = 19,080.88 : x
  2. Step 2: Convert to fraction form
    20,918/31,491.12 = 19,080.88/x
  3. Step 3: Cross multiply
    20,918x = 31,491.12 × 19,080.88
  4. Step 4: Simplify right side
    20,918x = 600,878,281.79
  5. Step 5: Solve for x
    x = 600,878,281.79/20,918
  6. Step 6: Final answer
    x = 28,725.42

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.51) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.