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Finding the Fourth Proportional to 1,237.69, 1,857.77 and 891.42

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Solution

The fourth proportional to 1,237.69, 1,857.77 and 891.42 is: 1,338.02

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,237.69 : 1,857.77 = 891.42 : x
  2. Step 2: Convert to fraction form
    1,237.69/1,857.77 = 891.42/x
  3. Step 3: Cross multiply
    1,237.69x = 1,857.77 × 891.42
  4. Step 4: Simplify right side
    1,237.69x = 1,656,053.33
  5. Step 5: Solve for x
    x = 1,656,053.33/1,237.69
  6. Step 6: Final answer
    x = 1,338.02

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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.