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Finding the Fourth Proportional to 3,455.31, 5,182.25 and 989.67

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Solution

The fourth proportional to 3,455.31, 5,182.25 and 989.67 is: 1,484.29

Step by Step Solution

  1. Step 1: Write the proportion equation
    3,455.31 : 5,182.25 = 989.67 : x
  2. Step 2: Convert to fraction form
    3,455.31/5,182.25 = 989.67/x
  3. Step 3: Cross multiply
    3,455.31x = 5,182.25 × 989.67
  4. Step 4: Simplify right side
    3,455.31x = 5,128,688.97
  5. Step 5: Solve for x
    x = 5,128,688.97/3,455.31
  6. Step 6: Final answer
    x = 1,484.29

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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.