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Finding the Fourth Proportional to 813.45, 1,220.16 and 236.32

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Solution

The fourth proportional to 813.45, 1,220.16 and 236.32 is: 354.48

Step by Step Solution

  1. Step 1: Write the proportion equation
    813.45 : 1,220.16 = 236.32 : x
  2. Step 2: Convert to fraction form
    813.45/1,220.16 = 236.32/x
  3. Step 3: Cross multiply
    813.45x = 1,220.16 × 236.32
  4. Step 4: Simplify right side
    813.45x = 288,348.21
  5. Step 5: Solve for x
    x = 288,348.21/813.45
  6. Step 6: Final answer
    x = 354.48

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Double scale
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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.