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Finding the Fourth Proportional to 1,090.41, 1,505.16 and 648.69

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Solution

The fourth proportional to 1,090.41, 1,505.16 and 648.69 is: 895.43

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,090.41 : 1,505.16 = 648.69 : x
  2. Step 2: Convert to fraction form
    1,090.41/1,505.16 = 648.69/x
  3. Step 3: Cross multiply
    1,090.41x = 1,505.16 × 648.69
  4. Step 4: Simplify right side
    1,090.41x = 976,382.24
  5. Step 5: Solve for x
    x = 976,382.24/1,090.41
  6. Step 6: Final answer
    x = 895.43

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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.