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Finding the Fourth Proportional to 853.96, 1,278.88 and 487.64

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Solution

The fourth proportional to 853.96, 1,278.88 and 487.64 is: 730.28

Step by Step Solution

  1. Step 1: Write the proportion equation
    853.96 : 1,278.88 = 487.64 : x
  2. Step 2: Convert to fraction form
    853.96/1,278.88 = 487.64/x
  3. Step 3: Cross multiply
    853.96x = 1,278.88 × 487.64
  4. Step 4: Simplify right side
    853.96x = 623,633.04
  5. Step 5: Solve for x
    x = 623,633.04/853.96
  6. Step 6: Final answer
    x = 730.28

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1.5x scale

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.