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Finding the Fourth Proportional to 993.80, 1,490.70 and 623.90

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Solution

The fourth proportional to 993.80, 1,490.70 and 623.90 is: 935.85

Step by Step Solution

  1. Step 1: Write the proportion equation
    993.80 : 1,490.70 = 623.90 : x
  2. Step 2: Convert to fraction form
    993.80/1,490.70 = 623.90/x
  3. Step 3: Cross multiply
    993.80x = 1,490.70 × 623.90
  4. Step 4: Simplify right side
    993.80x = 930,047.73
  5. Step 5: Solve for x
    x = 930,047.73/993.80
  6. Step 6: Final answer
    x = 935.85

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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.