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Finding the Fourth Proportional to 763.46, 1,145.64 and 276.56

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Solution

The fourth proportional to 763.46, 1,145.64 and 276.56 is: 415.00

Step by Step Solution

  1. Step 1: Write the proportion equation
    763.46 : 1,145.64 = 276.56 : x
  2. Step 2: Convert to fraction form
    763.46/1,145.64 = 276.56/x
  3. Step 3: Cross multiply
    763.46x = 1,145.64 × 276.56
  4. Step 4: Simplify right side
    763.46x = 316,838.20
  5. Step 5: Solve for x
    x = 316,838.20/763.46
  6. Step 6: Final answer
    x = 415.00

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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.