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Finding the Fourth Proportional to 1,689.56, 2,535.21 and 1,278.56

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Solution

The fourth proportional to 1,689.56, 2,535.21 and 1,278.56 is: 1,918.50

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,689.56 : 2,535.21 = 1,278.56 : x
  2. Step 2: Convert to fraction form
    1,689.56/2,535.21 = 1,278.56/x
  3. Step 3: Cross multiply
    1,689.56x = 2,535.21 × 1,278.56
  4. Step 4: Simplify right side
    1,689.56x = 3,241,418.10
  5. Step 5: Solve for x
    x = 3,241,418.10/1,689.56
  6. Step 6: Final answer
    x = 1,918.50

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.