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Finding the Fourth Proportional to 709.92, 1,065.12 and 276.84

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Solution

The fourth proportional to 709.92, 1,065.12 and 276.84 is: 415.35

Step by Step Solution

  1. Step 1: Write the proportion equation
    709.92 : 1,065.12 = 276.84 : x
  2. Step 2: Convert to fraction form
    709.92/1,065.12 = 276.84/x
  3. Step 3: Cross multiply
    709.92x = 1,065.12 × 276.84
  4. Step 4: Simplify right side
    709.92x = 294,867.82
  5. Step 5: Solve for x
    x = 294,867.82/709.92
  6. Step 6: Final answer
    x = 415.35

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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.