Home / 15,511.57-21,405.33-8,438.00

Finding the Fourth Proportional to 15,511.57, 21,405.33 and 8,438.00

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Solution

The fourth proportional to 15,511.57, 21,405.33 and 8,438.00 is: 11,644.09

Step by Step Solution

  1. Step 1: Write the proportion equation
    15,511.57 : 21,405.33 = 8,438.00 : x
  2. Step 2: Convert to fraction form
    15,511.57/21,405.33 = 8,438.00/x
  3. Step 3: Cross multiply
    15,511.57x = 21,405.33 × 8,438.00
  4. Step 4: Simplify right side
    15,511.57x = 180,618,067.51
  5. Step 5: Solve for x
    x = 180,618,067.51/15,511.57
  6. Step 6: Final answer
    x = 11,644.09

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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.