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Finding the Fourth Proportional to 14,915.70, 20,912.70 and 14,915.70

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Solution

The fourth proportional to 14,915.70, 20,912.70 and 14,915.70 is: 20,912.70

Step by Step Solution

  1. Step 1: Write the proportion equation
    14,915.70 : 20,912.70 = 14,915.70 : x
  2. Step 2: Convert to fraction form
    14,915.70/20,912.70 = 14,915.70/x
  3. Step 3: Cross multiply
    14,915.70x = 20,912.70 × 14,915.70
  4. Step 4: Simplify right side
    14,915.70x = 311,927,559.39
  5. Step 5: Solve for x
    x = 311,927,559.39/14,915.70
  6. Step 6: Final answer
    x = 20,912.70

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.40) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.