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Finding the Fourth Proportional to 1,638.53, 2,261.00 and 1,008.95

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Solution

The fourth proportional to 1,638.53, 2,261.00 and 1,008.95 is: 1,392.25

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,638.53 : 2,261.00 = 1,008.95 : x
  2. Step 2: Convert to fraction form
    1,638.53/2,261.00 = 1,008.95/x
  3. Step 3: Cross multiply
    1,638.53x = 2,261.00 × 1,008.95
  4. Step 4: Simplify right side
    1,638.53x = 2,281,230.91
  5. Step 5: Solve for x
    x = 2,281,230.91/1,638.53
  6. Step 6: Final answer
    x = 1,392.25

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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.