Home / 15,478.88-21,361.28-8,405.72

Finding the Fourth Proportional to 15,478.88, 21,361.28 and 8,405.72

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Solution

The fourth proportional to 15,478.88, 21,361.28 and 8,405.72 is: 11,600.12

Step by Step Solution

  1. Step 1: Write the proportion equation
    15,478.88 : 21,361.28 = 8,405.72 : x
  2. Step 2: Convert to fraction form
    15,478.88/21,361.28 = 8,405.72/x
  3. Step 3: Cross multiply
    15,478.88x = 21,361.28 × 8,405.72
  4. Step 4: Simplify right side
    15,478.88x = 179,556,938.52
  5. Step 5: Solve for x
    x = 179,556,938.52/15,478.88
  6. Step 6: Final answer
    x = 11,600.12

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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.