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Finding the Fourth Proportional to 715.74, 1,073.56 and 276.90

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Solution

The fourth proportional to 715.74, 1,073.56 and 276.90 is: 415.33

Step by Step Solution

  1. Step 1: Write the proportion equation
    715.74 : 1,073.56 = 276.90 : x
  2. Step 2: Convert to fraction form
    715.74/1,073.56 = 276.90/x
  3. Step 3: Cross multiply
    715.74x = 1,073.56 × 276.90
  4. Step 4: Simplify right side
    715.74x = 297,268.76
  5. Step 5: Solve for x
    x = 297,268.76/715.74
  6. Step 6: Final answer
    x = 415.33

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.