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Finding the Fourth Proportional to 1,357.20, 1,872.87 and 877.82

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Solution

The fourth proportional to 1,357.20, 1,872.87 and 877.82 is: 1,211.34

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,357.20 : 1,872.87 = 877.82 : x
  2. Step 2: Convert to fraction form
    1,357.20/1,872.87 = 877.82/x
  3. Step 3: Cross multiply
    1,357.20x = 1,872.87 × 877.82
  4. Step 4: Simplify right side
    1,357.20x = 1,644,030.09
  5. Step 5: Solve for x
    x = 1,644,030.09/1,357.20
  6. Step 6: Final answer
    x = 1,211.34

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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.