Home / 15,479.31-21,361.41-8,405.67

Finding the Fourth Proportional to 15,479.31, 21,361.41 and 8,405.67

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Solution

The fourth proportional to 15,479.31, 21,361.41 and 8,405.67 is: 11,599.80

Step by Step Solution

  1. Step 1: Write the proportion equation
    15,479.31 : 21,361.41 = 8,405.67 : x
  2. Step 2: Convert to fraction form
    15,479.31/21,361.41 = 8,405.67/x
  3. Step 3: Cross multiply
    15,479.31x = 21,361.41 × 8,405.67
  4. Step 4: Simplify right side
    15,479.31x = 179,556,963.19
  5. Step 5: Solve for x
    x = 179,556,963.19/15,479.31
  6. Step 6: Final answer
    x = 11,599.80

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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.