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Finding the Fourth Proportional to 855.18, 1,281.09 and 638.94

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Solution

The fourth proportional to 855.18, 1,281.09 and 638.94 is: 957.15

Step by Step Solution

  1. Step 1: Write the proportion equation
    855.18 : 1,281.09 = 638.94 : x
  2. Step 2: Convert to fraction form
    855.18/1,281.09 = 638.94/x
  3. Step 3: Cross multiply
    855.18x = 1,281.09 × 638.94
  4. Step 4: Simplify right side
    855.18x = 818,539.64
  5. Step 5: Solve for x
    x = 818,539.64/855.18
  6. Step 6: Final answer
    x = 957.15

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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.