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Finding the Fourth Proportional to 1,538.54, 2,122.56 and 874.86

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Solution

The fourth proportional to 1,538.54, 2,122.56 and 874.86 is: 1,206.95

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,538.54 : 2,122.56 = 874.86 : x
  2. Step 2: Convert to fraction form
    1,538.54/2,122.56 = 874.86/x
  3. Step 3: Cross multiply
    1,538.54x = 2,122.56 × 874.86
  4. Step 4: Simplify right side
    1,538.54x = 1,856,942.84
  5. Step 5: Solve for x
    x = 1,856,942.84/1,538.54
  6. Step 6: Final answer
    x = 1,206.95

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1.5x scale

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.