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Finding the Fourth Proportional to 940.21, 1,407.75 and 549.64

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Solution

The fourth proportional to 940.21, 1,407.75 and 549.64 is: 822.96

Step by Step Solution

  1. Step 1: Write the proportion equation
    940.21 : 1,407.75 = 549.64 : x
  2. Step 2: Convert to fraction form
    940.21/1,407.75 = 549.64/x
  3. Step 3: Cross multiply
    940.21x = 1,407.75 × 549.64
  4. Step 4: Simplify right side
    940.21x = 773,755.71
  5. Step 5: Solve for x
    x = 773,755.71/940.21
  6. Step 6: Final answer
    x = 822.96

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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.