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Finding the Fourth Proportional to 1,028.66, 1,420.77 and 696.51

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Solution

The fourth proportional to 1,028.66, 1,420.77 and 696.51 is: 962.01

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,028.66 : 1,420.77 = 696.51 : x
  2. Step 2: Convert to fraction form
    1,028.66/1,420.77 = 696.51/x
  3. Step 3: Cross multiply
    1,028.66x = 1,420.77 × 696.51
  4. Step 4: Simplify right side
    1,028.66x = 989,577.03
  5. Step 5: Solve for x
    x = 989,577.03/1,028.66
  6. Step 6: Final answer
    x = 962.01

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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.