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Finding the Fourth Proportional to 989.54, 1,486.61 and 578.96

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Solution

The fourth proportional to 989.54, 1,486.61 and 578.96 is: 869.80

Step by Step Solution

  1. Step 1: Write the proportion equation
    989.54 : 1,486.61 = 578.96 : x
  2. Step 2: Convert to fraction form
    989.54/1,486.61 = 578.96/x
  3. Step 3: Cross multiply
    989.54x = 1,486.61 × 578.96
  4. Step 4: Simplify right side
    989.54x = 860,692.89
  5. Step 5: Solve for x
    x = 860,692.89/989.54
  6. Step 6: Final answer
    x = 869.80

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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.