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Finding the Fourth Proportional to 1,761.72, 2,431.25 and 975.78

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Solution

The fourth proportional to 1,761.72, 2,431.25 and 975.78 is: 1,346.62

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,761.72 : 2,431.25 = 975.78 : x
  2. Step 2: Convert to fraction form
    1,761.72/2,431.25 = 975.78/x
  3. Step 3: Cross multiply
    1,761.72x = 2,431.25 × 975.78
  4. Step 4: Simplify right side
    1,761.72x = 2,372,365.13
  5. Step 5: Solve for x
    x = 2,372,365.13/1,761.72
  6. Step 6: Final answer
    x = 1,346.62

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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.