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Finding the Fourth Proportional to 14,885.10, 20,540.79 and 8,915.40

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Solution

The fourth proportional to 14,885.10, 20,540.79 and 8,915.40 is: 12,302.86

Step by Step Solution

  1. Step 1: Write the proportion equation
    14,885.10 : 20,540.79 = 8,915.40 : x
  2. Step 2: Convert to fraction form
    14,885.10/20,540.79 = 8,915.40/x
  3. Step 3: Cross multiply
    14,885.10x = 20,540.79 × 8,915.40
  4. Step 4: Simplify right side
    14,885.10x = 183,129,359.17
  5. Step 5: Solve for x
    x = 183,129,359.17/14,885.10
  6. Step 6: Final answer
    x = 12,302.86

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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.