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Finding the Fourth Proportional to 1,090.02, 1,504.79 and 840.78

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Solution

The fourth proportional to 1,090.02, 1,504.79 and 840.78 is: 1,160.71

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,090.02 : 1,504.79 = 840.78 : x
  2. Step 2: Convert to fraction form
    1,090.02/1,504.79 = 840.78/x
  3. Step 3: Cross multiply
    1,090.02x = 1,504.79 × 840.78
  4. Step 4: Simplify right side
    1,090.02x = 1,265,193.13
  5. Step 5: Solve for x
    x = 1,265,193.13/1,090.02
  6. Step 6: Final answer
    x = 1,160.71

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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.