Home / 15,511.09-21,405.42-8,437.57

Finding the Fourth Proportional to 15,511.09, 21,405.42 and 8,437.57

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Solution

The fourth proportional to 15,511.09, 21,405.42 and 8,437.57 is: 11,643.91

Step by Step Solution

  1. Step 1: Write the proportion equation
    15,511.09 : 21,405.42 = 8,437.57 : x
  2. Step 2: Convert to fraction form
    15,511.09/21,405.42 = 8,437.57/x
  3. Step 3: Cross multiply
    15,511.09x = 21,405.42 × 8,437.57
  4. Step 4: Simplify right side
    15,511.09x = 180,609,729.63
  5. Step 5: Solve for x
    x = 180,609,729.63/15,511.09
  6. Step 6: Final answer
    x = 11,643.91

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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.