Home / 15,511.10-21,405.49-8,437.54

Finding the Fourth Proportional to 15,511.10, 21,405.49 and 8,437.54

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Solution

The fourth proportional to 15,511.10, 21,405.49 and 8,437.54 is: 11,643.90

Step by Step Solution

  1. Step 1: Write the proportion equation
    15,511.10 : 21,405.49 = 8,437.54 : x
  2. Step 2: Convert to fraction form
    15,511.10/21,405.49 = 8,437.54/x
  3. Step 3: Cross multiply
    15,511.10x = 21,405.49 × 8,437.54
  4. Step 4: Simplify right side
    15,511.10x = 180,609,683.76
  5. Step 5: Solve for x
    x = 180,609,683.76/15,511.10
  6. Step 6: Final answer
    x = 11,643.90

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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.