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Finding the Fourth Proportional to 18,775.84, 28,103.28 and 12,915.04

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Solution

The fourth proportional to 18,775.84, 28,103.28 and 12,915.04 is: 19,330.96

Step by Step Solution

  1. Step 1: Write the proportion equation
    18,775.84 : 28,103.28 = 12,915.04 : x
  2. Step 2: Convert to fraction form
    18,775.84/28,103.28 = 12,915.04/x
  3. Step 3: Cross multiply
    18,775.84x = 28,103.28 × 12,915.04
  4. Step 4: Simplify right side
    18,775.84x = 362,954,985.33
  5. Step 5: Solve for x
    x = 362,954,985.33/18,775.84
  6. Step 6: Final answer
    x = 19,330.96

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.