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Finding the Fourth Proportional to 18,715.53, 28,056.78 and 7,631.49

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Solution

The fourth proportional to 18,715.53, 28,056.78 and 7,631.49 is: 11,440.50

Step by Step Solution

  1. Step 1: Write the proportion equation
    18,715.53 : 28,056.78 = 7,631.49 : x
  2. Step 2: Convert to fraction form
    18,715.53/28,056.78 = 7,631.49/x
  3. Step 3: Cross multiply
    18,715.53x = 28,056.78 × 7,631.49
  4. Step 4: Simplify right side
    18,715.53x = 214,114,895.72
  5. Step 5: Solve for x
    x = 214,114,895.72/18,715.53
  6. Step 6: Final answer
    x = 11,440.50

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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.