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Finding the Fourth Proportional to 775.40, 1,162.78 and 313.16

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Solution

The fourth proportional to 775.40, 1,162.78 and 313.16 is: 469.61

Step by Step Solution

  1. Step 1: Write the proportion equation
    775.40 : 1,162.78 = 313.16 : x
  2. Step 2: Convert to fraction form
    775.40/1,162.78 = 313.16/x
  3. Step 3: Cross multiply
    775.40x = 1,162.78 × 313.16
  4. Step 4: Simplify right side
    775.40x = 364,136.18
  5. Step 5: Solve for x
    x = 364,136.18/775.40
  6. Step 6: Final answer
    x = 469.61

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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.