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Finding the Fourth Proportional to 775.52, 1,163.24 and 390.76

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Solution

The fourth proportional to 775.52, 1,163.24 and 390.76 is: 586.12

Step by Step Solution

  1. Step 1: Write the proportion equation
    775.52 : 1,163.24 = 390.76 : x
  2. Step 2: Convert to fraction form
    775.52/1,163.24 = 390.76/x
  3. Step 3: Cross multiply
    775.52x = 1,163.24 × 390.76
  4. Step 4: Simplify right side
    775.52x = 454,547.66
  5. Step 5: Solve for x
    x = 454,547.66/775.52
  6. Step 6: Final answer
    x = 586.12

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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.