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Finding the Fourth Proportional to 1,090.36, 1,505.10 and 717.46

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Solution

The fourth proportional to 1,090.36, 1,505.10 and 717.46 is: 990.36

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,090.36 : 1,505.10 = 717.46 : x
  2. Step 2: Convert to fraction form
    1,090.36/1,505.10 = 717.46/x
  3. Step 3: Cross multiply
    1,090.36x = 1,505.10 × 717.46
  4. Step 4: Simplify right side
    1,090.36x = 1,079,849.05
  5. Step 5: Solve for x
    x = 1,079,849.05/1,090.36
  6. Step 6: Final answer
    x = 990.36

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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.