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Finding the Fourth Proportional to 989.38, 1,485.19 and 624.38

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Solution

The fourth proportional to 989.38, 1,485.19 and 624.38 is: 937.27

Step by Step Solution

  1. Step 1: Write the proportion equation
    989.38 : 1,485.19 = 624.38 : x
  2. Step 2: Convert to fraction form
    989.38/1,485.19 = 624.38/x
  3. Step 3: Cross multiply
    989.38x = 1,485.19 × 624.38
  4. Step 4: Simplify right side
    989.38x = 927,316.29
  5. Step 5: Solve for x
    x = 927,316.29/989.38
  6. Step 6: Final answer
    x = 937.27

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1.5x scale

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.