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Finding the Fourth Proportional to 1,453.82, 2,178.80 and 761.08

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Solution

The fourth proportional to 1,453.82, 2,178.80 and 761.08 is: 1,140.61

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,453.82 : 2,178.80 = 761.08 : x
  2. Step 2: Convert to fraction form
    1,453.82/2,178.80 = 761.08/x
  3. Step 3: Cross multiply
    1,453.82x = 2,178.80 × 761.08
  4. Step 4: Simplify right side
    1,453.82x = 1,658,241.10
  5. Step 5: Solve for x
    x = 1,658,241.10/1,453.82
  6. Step 6: Final answer
    x = 1,140.61

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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.