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Finding the Fourth Proportional to 811.71, 1,216.54 and 441.51

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Solution

The fourth proportional to 811.71, 1,216.54 and 441.51 is: 661.71

Step by Step Solution

  1. Step 1: Write the proportion equation
    811.71 : 1,216.54 = 441.51 : x
  2. Step 2: Convert to fraction form
    811.71/1,216.54 = 441.51/x
  3. Step 3: Cross multiply
    811.71x = 1,216.54 × 441.51
  4. Step 4: Simplify right side
    811.71x = 537,114.58
  5. Step 5: Solve for x
    x = 537,114.58/811.71
  6. Step 6: Final answer
    x = 661.71

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Double scale
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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.