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Finding the Fourth Proportional to 3,587.34, 5,380.38 and 989.58

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Solution

The fourth proportional to 3,587.34, 5,380.38 and 989.58 is: 1,484.20

Step by Step Solution

  1. Step 1: Write the proportion equation
    3,587.34 : 5,380.38 = 989.58 : x
  2. Step 2: Convert to fraction form
    3,587.34/5,380.38 = 989.58/x
  3. Step 3: Cross multiply
    3,587.34x = 5,380.38 × 989.58
  4. Step 4: Simplify right side
    3,587.34x = 5,324,316.44
  5. Step 5: Solve for x
    x = 5,324,316.44/3,587.34
  6. Step 6: Final answer
    x = 1,484.20

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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.