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Finding the Fourth Proportional to 1,274.64, 1,759 and 715.08

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Solution

The fourth proportional to 1,274.64, 1,759 and 715.08 is: 986.81

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,274.64 : 1,759 = 715.08 : x
  2. Step 2: Convert to fraction form
    1,274.64/1,759 = 715.08/x
  3. Step 3: Cross multiply
    1,274.64x = 1,759 × 715.08
  4. Step 4: Simplify right side
    1,274.64x = 1,257,825.72
  5. Step 5: Solve for x
    x = 1,257,825.72/1,274.64
  6. Step 6: Final answer
    x = 986.81

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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.