Home / 21,150.20-31,709.28-12,828.08

Finding the Fourth Proportional to 21,150.20, 31,709.28 and 12,828.08

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Solution

The fourth proportional to 21,150.20, 31,709.28 and 12,828.08 is: 19,232.40

Step by Step Solution

  1. Step 1: Write the proportion equation
    21,150.20 : 31,709.28 = 12,828.08 : x
  2. Step 2: Convert to fraction form
    21,150.20/31,709.28 = 12,828.08/x
  3. Step 3: Cross multiply
    21,150.20x = 31,709.28 × 12,828.08
  4. Step 4: Simplify right side
    21,150.20x = 406,769,180.58
  5. Step 5: Solve for x
    x = 406,769,180.58/21,150.20
  6. Step 6: Final answer
    x = 19,232.40

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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.