Home / 15,511.65-21,406.53-8,438.55

Finding the Fourth Proportional to 15,511.65, 21,406.53 and 8,438.55

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Solution

The fourth proportional to 15,511.65, 21,406.53 and 8,438.55 is: 11,645.45

Step by Step Solution

  1. Step 1: Write the proportion equation
    15,511.65 : 21,406.53 = 8,438.55 : x
  2. Step 2: Convert to fraction form
    15,511.65/21,406.53 = 8,438.55/x
  3. Step 3: Cross multiply
    15,511.65x = 21,406.53 × 8,438.55
  4. Step 4: Simplify right side
    15,511.65x = 180,640,073.73
  5. Step 5: Solve for x
    x = 180,640,073.73/15,511.65
  6. Step 6: Final answer
    x = 11,645.45

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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.