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Finding the Fourth Proportional to 854.15, 1,281.83 and 637.88

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Solution

The fourth proportional to 854.15, 1,281.83 and 637.88 is: 957.27

Step by Step Solution

  1. Step 1: Write the proportion equation
    854.15 : 1,281.83 = 637.88 : x
  2. Step 2: Convert to fraction form
    854.15/1,281.83 = 637.88/x
  3. Step 3: Cross multiply
    854.15x = 1,281.83 × 637.88
  4. Step 4: Simplify right side
    854.15x = 817,644.12
  5. Step 5: Solve for x
    x = 817,644.12/854.15
  6. Step 6: Final answer
    x = 957.27

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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.