Home / 21,869.12-30,179.04-12,915.60

Finding the Fourth Proportional to 21,869.12, 30,179.04 and 12,915.60

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Solution

The fourth proportional to 21,869.12, 30,179.04 and 12,915.60 is: 17,823.32

Step by Step Solution

  1. Step 1: Write the proportion equation
    21,869.12 : 30,179.04 = 12,915.60 : x
  2. Step 2: Convert to fraction form
    21,869.12/30,179.04 = 12,915.60/x
  3. Step 3: Cross multiply
    21,869.12x = 30,179.04 × 12,915.60
  4. Step 4: Simplify right side
    21,869.12x = 389,780,409.02
  5. Step 5: Solve for x
    x = 389,780,409.02/21,869.12
  6. Step 6: Final answer
    x = 17,823.32

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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.