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Finding the Fourth Proportional to 853.94, 1,281.36 and 421.04

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Solution

The fourth proportional to 853.94, 1,281.36 and 421.04 is: 631.78

Step by Step Solution

  1. Step 1: Write the proportion equation
    853.94 : 1,281.36 = 421.04 : x
  2. Step 2: Convert to fraction form
    853.94/1,281.36 = 421.04/x
  3. Step 3: Cross multiply
    853.94x = 1,281.36 × 421.04
  4. Step 4: Simplify right side
    853.94x = 539,503.81
  5. Step 5: Solve for x
    x = 539,503.81/853.94
  6. Step 6: Final answer
    x = 631.78

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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.