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Finding the Fourth Proportional to 1,617.56, 2,235 and 1,288.88

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Solution

The fourth proportional to 1,617.56, 2,235 and 1,288.88 is: 1,780.86

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,617.56 : 2,235 = 1,288.88 : x
  2. Step 2: Convert to fraction form
    1,617.56/2,235 = 1,288.88/x
  3. Step 3: Cross multiply
    1,617.56x = 2,235 × 1,288.88
  4. Step 4: Simplify right side
    1,617.56x = 2,880,646.80
  5. Step 5: Solve for x
    x = 2,880,646.80/1,617.56
  6. Step 6: Final answer
    x = 1,780.86

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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.