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Finding the Fourth Proportional to 989.40, 1,485.30 and 625.70

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Solution

The fourth proportional to 989.40, 1,485.30 and 625.70 is: 939.31

Step by Step Solution

  1. Step 1: Write the proportion equation
    989.40 : 1,485.30 = 625.70 : x
  2. Step 2: Convert to fraction form
    989.40/1,485.30 = 625.70/x
  3. Step 3: Cross multiply
    989.40x = 1,485.30 × 625.70
  4. Step 4: Simplify right side
    989.40x = 929,352.21
  5. Step 5: Solve for x
    x = 929,352.21/989.40
  6. Step 6: Final answer
    x = 939.31

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These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.