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Finding the Fourth Proportional to 811.38, 1,216.54 and 291.12

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Solution

The fourth proportional to 811.38, 1,216.54 and 291.12 is: 436.49

Step by Step Solution

  1. Step 1: Write the proportion equation
    811.38 : 1,216.54 = 291.12 : x
  2. Step 2: Convert to fraction form
    811.38/1,216.54 = 291.12/x
  3. Step 3: Cross multiply
    811.38x = 1,216.54 × 291.12
  4. Step 4: Simplify right side
    811.38x = 354,158.40
  5. Step 5: Solve for x
    x = 354,158.40/811.38
  6. Step 6: Final answer
    x = 436.49

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Half scale
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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.