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Finding the Fourth Proportional to 1,274.85, 1,759.31 and 715.43

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Solution

The fourth proportional to 1,274.85, 1,759.31 and 715.43 is: 987.30

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,274.85 : 1,759.31 = 715.43 : x
  2. Step 2: Convert to fraction form
    1,274.85/1,759.31 = 715.43/x
  3. Step 3: Cross multiply
    1,274.85x = 1,759.31 × 715.43
  4. Step 4: Simplify right side
    1,274.85x = 1,258,663.15
  5. Step 5: Solve for x
    x = 1,258,663.15/1,274.85
  6. Step 6: Final answer
    x = 987.30

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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.