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Finding the Fourth Proportional to 7,900.72, 10,905.18 and 4,914.78

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Solution

The fourth proportional to 7,900.72, 10,905.18 and 4,914.78 is: 6,783.76

Step by Step Solution

  1. Step 1: Write the proportion equation
    7,900.72 : 10,905.18 = 4,914.78 : x
  2. Step 2: Convert to fraction form
    7,900.72/10,905.18 = 4,914.78/x
  3. Step 3: Cross multiply
    7,900.72x = 10,905.18 × 4,914.78
  4. Step 4: Simplify right side
    7,900.72x = 53,596,560.56
  5. Step 5: Solve for x
    x = 53,596,560.56/7,900.72
  6. Step 6: Final answer
    x = 6,783.76

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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.