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Finding the Fourth Proportional to 821.25, 1,133.38 and 471.94

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Solution

The fourth proportional to 821.25, 1,133.38 and 471.94 is: 651.31

Step by Step Solution

  1. Step 1: Write the proportion equation
    821.25 : 1,133.38 = 471.94 : x
  2. Step 2: Convert to fraction form
    821.25/1,133.38 = 471.94/x
  3. Step 3: Cross multiply
    821.25x = 1,133.38 × 471.94
  4. Step 4: Simplify right side
    821.25x = 534,885.11
  5. Step 5: Solve for x
    x = 534,885.11/821.25
  6. Step 6: Final answer
    x = 651.31

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Double scale
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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.