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Finding the Fourth Proportional to 996.21, 1,374.75 and 554.10

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Solution

The fourth proportional to 996.21, 1,374.75 and 554.10 is: 764.64

Step by Step Solution

  1. Step 1: Write the proportion equation
    996.21 : 1,374.75 = 554.10 : x
  2. Step 2: Convert to fraction form
    996.21/1,374.75 = 554.10/x
  3. Step 3: Cross multiply
    996.21x = 1,374.75 × 554.10
  4. Step 4: Simplify right side
    996.21x = 761,743.82
  5. Step 5: Solve for x
    x = 761,743.82/996.21
  6. Step 6: Final answer
    x = 764.64

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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.