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Finding the Fourth Proportional to 989.20, 1,483.80 and 624.70

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Solution

The fourth proportional to 989.20, 1,483.80 and 624.70 is: 937.05

Step by Step Solution

  1. Step 1: Write the proportion equation
    989.20 : 1,483.80 = 624.70 : x
  2. Step 2: Convert to fraction form
    989.20/1,483.80 = 624.70/x
  3. Step 3: Cross multiply
    989.20x = 1,483.80 × 624.70
  4. Step 4: Simplify right side
    989.20x = 926,929.86
  5. Step 5: Solve for x
    x = 926,929.86/989.20
  6. Step 6: Final answer
    x = 937.05

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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.