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Finding the Fourth Proportional to 1,674.42, 2,511.56 and 687.20

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Solution

The fourth proportional to 1,674.42, 2,511.56 and 687.20 is: 1,030.76

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,674.42 : 2,511.56 = 687.20 : x
  2. Step 2: Convert to fraction form
    1,674.42/2,511.56 = 687.20/x
  3. Step 3: Cross multiply
    1,674.42x = 2,511.56 × 687.20
  4. Step 4: Simplify right side
    1,674.42x = 1,725,928.04
  5. Step 5: Solve for x
    x = 1,725,928.04/1,674.42
  6. Step 6: Final answer
    x = 1,030.76

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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.