Home / 21,308.20-31,962.30-12,851.80

Finding the Fourth Proportional to 21,308.20, 31,962.30 and 12,851.80

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Solution

The fourth proportional to 21,308.20, 31,962.30 and 12,851.80 is: 19,277.70

Step by Step Solution

  1. Step 1: Write the proportion equation
    21,308.20 : 31,962.30 = 12,851.80 : x
  2. Step 2: Convert to fraction form
    21,308.20/31,962.30 = 12,851.80/x
  3. Step 3: Cross multiply
    21,308.20x = 31,962.30 × 12,851.80
  4. Step 4: Simplify right side
    21,308.20x = 410,773,087.14
  5. Step 5: Solve for x
    x = 410,773,087.14/21,308.20
  6. Step 6: Final answer
    x = 19,277.70

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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.