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Finding the Fourth Proportional to 1,985.31, 2,964.60 and 1,620.81

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Solution

The fourth proportional to 1,985.31, 2,964.60 and 1,620.81 is: 2,420.30

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,985.31 : 2,964.60 = 1,620.81 : x
  2. Step 2: Convert to fraction form
    1,985.31/2,964.60 = 1,620.81/x
  3. Step 3: Cross multiply
    1,985.31x = 2,964.60 × 1,620.81
  4. Step 4: Simplify right side
    1,985.31x = 4,805,053.33
  5. Step 5: Solve for x
    x = 4,805,053.33/1,985.31
  6. Step 6: Final answer
    x = 2,420.30

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Why These Related Problems?

These problems maintain the same ratio (1.49) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.