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Finding the Fourth Proportional to 5,253.56, 7,878.72 and 1,790

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Solution

The fourth proportional to 5,253.56, 7,878.72 and 1,790 is: 2,684.45

Step by Step Solution

  1. Step 1: Write the proportion equation
    5,253.56 : 7,878.72 = 1,790 : x
  2. Step 2: Convert to fraction form
    5,253.56/7,878.72 = 1,790/x
  3. Step 3: Cross multiply
    5,253.56x = 7,878.72 × 1,790
  4. Step 4: Simplify right side
    5,253.56x = 14,102,908.80
  5. Step 5: Solve for x
    x = 14,102,908.80/5,253.56
  6. Step 6: Final answer
    x = 2,684.45

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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.