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Finding the Fourth Proportional to 1,261.29, 1,740.04 and 722.64

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Solution

The fourth proportional to 1,261.29, 1,740.04 and 722.64 is: 996.93

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,261.29 : 1,740.04 = 722.64 : x
  2. Step 2: Convert to fraction form
    1,261.29/1,740.04 = 722.64/x
  3. Step 3: Cross multiply
    1,261.29x = 1,740.04 × 722.64
  4. Step 4: Simplify right side
    1,261.29x = 1,257,418.89
  5. Step 5: Solve for x
    x = 1,257,418.89/1,261.29
  6. Step 6: Final answer
    x = 996.93

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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.