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Finding the Fourth Proportional to 989.86, 1,485.15 and 527.68

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Solution

The fourth proportional to 989.86, 1,485.15 and 527.68 is: 791.71

Step by Step Solution

  1. Step 1: Write the proportion equation
    989.86 : 1,485.15 = 527.68 : x
  2. Step 2: Convert to fraction form
    989.86/1,485.15 = 527.68/x
  3. Step 3: Cross multiply
    989.86x = 1,485.15 × 527.68
  4. Step 4: Simplify right side
    989.86x = 783,683.95
  5. Step 5: Solve for x
    x = 783,683.95/989.86
  6. Step 6: Final answer
    x = 791.71

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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.