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Finding the Fourth Proportional to 4,747.67, 7,120.86 and 1,415.86

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Solution

The fourth proportional to 4,747.67, 7,120.86 and 1,415.86 is: 2,123.60

Step by Step Solution

  1. Step 1: Write the proportion equation
    4,747.67 : 7,120.86 = 1,415.86 : x
  2. Step 2: Convert to fraction form
    4,747.67/7,120.86 = 1,415.86/x
  3. Step 3: Cross multiply
    4,747.67x = 7,120.86 × 1,415.86
  4. Step 4: Simplify right side
    4,747.67x = 10,082,140.84
  5. Step 5: Solve for x
    x = 10,082,140.84/4,747.67
  6. Step 6: Final answer
    x = 2,123.60

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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.