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Finding the Fourth Proportional to 854.18, 1,178.06 and 721.72

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Solution

The fourth proportional to 854.18, 1,178.06 and 721.72 is: 995.36

Step by Step Solution

  1. Step 1: Write the proportion equation
    854.18 : 1,178.06 = 721.72 : x
  2. Step 2: Convert to fraction form
    854.18/1,178.06 = 721.72/x
  3. Step 3: Cross multiply
    854.18x = 1,178.06 × 721.72
  4. Step 4: Simplify right side
    854.18x = 850,219.96
  5. Step 5: Solve for x
    x = 850,219.96/854.18
  6. Step 6: Final answer
    x = 995.36

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Double scale
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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.