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Finding the Fourth Proportional to 1,090.34, 1,505.76 and 940.64

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Solution

The fourth proportional to 1,090.34, 1,505.76 and 940.64 is: 1,299.02

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,090.34 : 1,505.76 = 940.64 : x
  2. Step 2: Convert to fraction form
    1,090.34/1,505.76 = 940.64/x
  3. Step 3: Cross multiply
    1,090.34x = 1,505.76 × 940.64
  4. Step 4: Simplify right side
    1,090.34x = 1,416,378.09
  5. Step 5: Solve for x
    x = 1,416,378.09/1,090.34
  6. Step 6: Final answer
    x = 1,299.02

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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.