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Finding the Fourth Proportional to 1,639, 2,261.82 and 940.78

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Solution

The fourth proportional to 1,639, 2,261.82 and 940.78 is: 1,298.28

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,639 : 2,261.82 = 940.78 : x
  2. Step 2: Convert to fraction form
    1,639/2,261.82 = 940.78/x
  3. Step 3: Cross multiply
    1,639x = 2,261.82 × 940.78
  4. Step 4: Simplify right side
    1,639x = 2,127,875.02
  5. Step 5: Solve for x
    x = 2,127,875.02/1,639
  6. Step 6: Final answer
    x = 1,298.28

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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.