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Finding the Fourth Proportional to 847.96, 1,169.58 and 721.60

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Solution

The fourth proportional to 847.96, 1,169.58 and 721.60 is: 995.30

Step by Step Solution

  1. Step 1: Write the proportion equation
    847.96 : 1,169.58 = 721.60 : x
  2. Step 2: Convert to fraction form
    847.96/1,169.58 = 721.60/x
  3. Step 3: Cross multiply
    847.96x = 1,169.58 × 721.60
  4. Step 4: Simplify right side
    847.96x = 843,968.71
  5. Step 5: Solve for x
    x = 843,968.71/847.96
  6. Step 6: Final answer
    x = 995.30

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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.