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Finding the Fourth Proportional to 989.72, 1,485.03 and 527.61

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Solution

The fourth proportional to 989.72, 1,485.03 and 527.61 is: 791.66

Step by Step Solution

  1. Step 1: Write the proportion equation
    989.72 : 1,485.03 = 527.61 : x
  2. Step 2: Convert to fraction form
    989.72/1,485.03 = 527.61/x
  3. Step 3: Cross multiply
    989.72x = 1,485.03 × 527.61
  4. Step 4: Simplify right side
    989.72x = 783,524.23
  5. Step 5: Solve for x
    x = 783,524.23/989.72
  6. Step 6: Final answer
    x = 791.66

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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.