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Finding the Fourth Proportional to 931.46, 1,283.38 and 620.42

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Solution

The fourth proportional to 931.46, 1,283.38 and 620.42 is: 854.82

Step by Step Solution

  1. Step 1: Write the proportion equation
    931.46 : 1,283.38 = 620.42 : x
  2. Step 2: Convert to fraction form
    931.46/1,283.38 = 620.42/x
  3. Step 3: Cross multiply
    931.46x = 1,283.38 × 620.42
  4. Step 4: Simplify right side
    931.46x = 796,226.65
  5. Step 5: Solve for x
    x = 796,226.65/931.46
  6. Step 6: Final answer
    x = 854.82

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.