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Finding the Fourth Proportional to 912.49, 1,368.33 and 638.71

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Solution

The fourth proportional to 912.49, 1,368.33 and 638.71 is: 957.78

Step by Step Solution

  1. Step 1: Write the proportion equation
    912.49 : 1,368.33 = 638.71 : x
  2. Step 2: Convert to fraction form
    912.49/1,368.33 = 638.71/x
  3. Step 3: Cross multiply
    912.49x = 1,368.33 × 638.71
  4. Step 4: Simplify right side
    912.49x = 873,966.05
  5. Step 5: Solve for x
    x = 873,966.05/912.49
  6. Step 6: Final answer
    x = 957.78

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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.