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Finding the Fourth Proportional to 1,253.28, 1,878.66 and 559.56

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Solution

The fourth proportional to 1,253.28, 1,878.66 and 559.56 is: 838.78

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,253.28 : 1,878.66 = 559.56 : x
  2. Step 2: Convert to fraction form
    1,253.28/1,878.66 = 559.56/x
  3. Step 3: Cross multiply
    1,253.28x = 1,878.66 × 559.56
  4. Step 4: Simplify right side
    1,253.28x = 1,051,222.99
  5. Step 5: Solve for x
    x = 1,051,222.99/1,253.28
  6. Step 6: Final answer
    x = 838.78

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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.