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Finding the Fourth Proportional to 993.92, 1,490.72 and 627.60

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Solution

The fourth proportional to 993.92, 1,490.72 and 627.60 is: 941.30

Step by Step Solution

  1. Step 1: Write the proportion equation
    993.92 : 1,490.72 = 627.60 : x
  2. Step 2: Convert to fraction form
    993.92/1,490.72 = 627.60/x
  3. Step 3: Cross multiply
    993.92x = 1,490.72 × 627.60
  4. Step 4: Simplify right side
    993.92x = 935,575.87
  5. Step 5: Solve for x
    x = 935,575.87/993.92
  6. Step 6: Final answer
    x = 941.30

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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.