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Finding the Fourth Proportional to 1,721.76, 2,580.18 and 855.06

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Solution

The fourth proportional to 1,721.76, 2,580.18 and 855.06 is: 1,281.37

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,721.76 : 2,580.18 = 855.06 : x
  2. Step 2: Convert to fraction form
    1,721.76/2,580.18 = 855.06/x
  3. Step 3: Cross multiply
    1,721.76x = 2,580.18 × 855.06
  4. Step 4: Simplify right side
    1,721.76x = 2,206,208.71
  5. Step 5: Solve for x
    x = 2,206,208.71/1,721.76
  6. Step 6: Final answer
    x = 1,281.37

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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.