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Finding the Fourth Proportional to 1,708.20, 2,561.49 and 841.50

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Solution

The fourth proportional to 1,708.20, 2,561.49 and 841.50 is: 1,261.85

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,708.20 : 2,561.49 = 841.50 : x
  2. Step 2: Convert to fraction form
    1,708.20/2,561.49 = 841.50/x
  3. Step 3: Cross multiply
    1,708.20x = 2,561.49 × 841.50
  4. Step 4: Simplify right side
    1,708.20x = 2,155,493.84
  5. Step 5: Solve for x
    x = 2,155,493.84/1,708.20
  6. Step 6: Final answer
    x = 1,261.85

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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.