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Finding the Fourth Proportional to 1,274.59, 1,758.81 and 715.15

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Solution

The fourth proportional to 1,274.59, 1,758.81 and 715.15 is: 986.84

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,274.59 : 1,758.81 = 715.15 : x
  2. Step 2: Convert to fraction form
    1,274.59/1,758.81 = 715.15/x
  3. Step 3: Cross multiply
    1,274.59x = 1,758.81 × 715.15
  4. Step 4: Simplify right side
    1,274.59x = 1,257,812.97
  5. Step 5: Solve for x
    x = 1,257,812.97/1,274.59
  6. Step 6: Final answer
    x = 986.84

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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.