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Finding the Fourth Proportional to 1,721.80, 2,582.70 and 855.76

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Solution

The fourth proportional to 1,721.80, 2,582.70 and 855.76 is: 1,283.64

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,721.80 : 2,582.70 = 855.76 : x
  2. Step 2: Convert to fraction form
    1,721.80/2,582.70 = 855.76/x
  3. Step 3: Cross multiply
    1,721.80x = 2,582.70 × 855.76
  4. Step 4: Simplify right side
    1,721.80x = 2,210,171.35
  5. Step 5: Solve for x
    x = 2,210,171.35/1,721.80
  6. Step 6: Final answer
    x = 1,283.64

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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.