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Finding the Fourth Proportional to 763.66, 1,145.50 and 276.70

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Solution

The fourth proportional to 763.66, 1,145.50 and 276.70 is: 415.05

Step by Step Solution

  1. Step 1: Write the proportion equation
    763.66 : 1,145.50 = 276.70 : x
  2. Step 2: Convert to fraction form
    763.66/1,145.50 = 276.70/x
  3. Step 3: Cross multiply
    763.66x = 1,145.50 × 276.70
  4. Step 4: Simplify right side
    763.66x = 316,956.29
  5. Step 5: Solve for x
    x = 316,956.29/763.66
  6. Step 6: Final answer
    x = 415.05

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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.