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Finding the Fourth Proportional to 989.62, 1,485.49 and 502.54

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Solution

The fourth proportional to 989.62, 1,485.49 and 502.54 is: 754.35

Step by Step Solution

  1. Step 1: Write the proportion equation
    989.62 : 1,485.49 = 502.54 : x
  2. Step 2: Convert to fraction form
    989.62/1,485.49 = 502.54/x
  3. Step 3: Cross multiply
    989.62x = 1,485.49 × 502.54
  4. Step 4: Simplify right side
    989.62x = 746,518.14
  5. Step 5: Solve for x
    x = 746,518.14/989.62
  6. Step 6: Final answer
    x = 754.35

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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.