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Finding the Fourth Proportional to 854.19, 1,281.30 and 639.13

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Solution

The fourth proportional to 854.19, 1,281.30 and 639.13 is: 958.71

Step by Step Solution

  1. Step 1: Write the proportion equation
    854.19 : 1,281.30 = 639.13 : x
  2. Step 2: Convert to fraction form
    854.19/1,281.30 = 639.13/x
  3. Step 3: Cross multiply
    854.19x = 1,281.30 × 639.13
  4. Step 4: Simplify right side
    854.19x = 818,917.27
  5. Step 5: Solve for x
    x = 818,917.27/854.19
  6. Step 6: Final answer
    x = 958.71

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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.