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Finding the Fourth Proportional to 790.66, 1,090.97 and 555.33

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Solution

The fourth proportional to 790.66, 1,090.97 and 555.33 is: 766.25

Step by Step Solution

  1. Step 1: Write the proportion equation
    790.66 : 1,090.97 = 555.33 : x
  2. Step 2: Convert to fraction form
    790.66/1,090.97 = 555.33/x
  3. Step 3: Cross multiply
    790.66x = 1,090.97 × 555.33
  4. Step 4: Simplify right side
    790.66x = 605,845.63
  5. Step 5: Solve for x
    x = 605,845.63/790.66
  6. Step 6: Final answer
    x = 766.25

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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.