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Finding the Fourth Proportional to 1,721.04, 2,581.62 and 989.04

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Solution

The fourth proportional to 1,721.04, 2,581.62 and 989.04 is: 1,483.59

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,721.04 : 2,581.62 = 989.04 : x
  2. Step 2: Convert to fraction form
    1,721.04/2,581.62 = 989.04/x
  3. Step 3: Cross multiply
    1,721.04x = 2,581.62 × 989.04
  4. Step 4: Simplify right side
    1,721.04x = 2,553,325.44
  5. Step 5: Solve for x
    x = 2,553,325.44/1,721.04
  6. Step 6: Final answer
    x = 1,483.59

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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.