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Finding the Fourth Proportional to 1,274.57, 1,758.80 and 715.04

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Solution

The fourth proportional to 1,274.57, 1,758.80 and 715.04 is: 986.69

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,274.57 : 1,758.80 = 715.04 : x
  2. Step 2: Convert to fraction form
    1,274.57/1,758.80 = 715.04/x
  3. Step 3: Cross multiply
    1,274.57x = 1,758.80 × 715.04
  4. Step 4: Simplify right side
    1,274.57x = 1,257,605.35
  5. Step 5: Solve for x
    x = 1,257,605.35/1,274.57
  6. Step 6: Final answer
    x = 986.69

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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.