Home / 15,511.40-21,405.30-8,438.12

Finding the Fourth Proportional to 15,511.40, 21,405.30 and 8,438.12

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Solution

The fourth proportional to 15,511.40, 21,405.30 and 8,438.12 is: 11,644.37

Step by Step Solution

  1. Step 1: Write the proportion equation
    15,511.40 : 21,405.30 = 8,438.12 : x
  2. Step 2: Convert to fraction form
    15,511.40/21,405.30 = 8,438.12/x
  3. Step 3: Cross multiply
    15,511.40x = 21,405.30 × 8,438.12
  4. Step 4: Simplify right side
    15,511.40x = 180,620,490.04
  5. Step 5: Solve for x
    x = 180,620,490.04/15,511.40
  6. Step 6: Final answer
    x = 11,644.37

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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.