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Finding the Fourth Proportional to 993.42, 1,489.95 and 627.12

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Solution

The fourth proportional to 993.42, 1,489.95 and 627.12 is: 940.57

Step by Step Solution

  1. Step 1: Write the proportion equation
    993.42 : 1,489.95 = 627.12 : x
  2. Step 2: Convert to fraction form
    993.42/1,489.95 = 627.12/x
  3. Step 3: Cross multiply
    993.42x = 1,489.95 × 627.12
  4. Step 4: Simplify right side
    993.42x = 934,377.44
  5. Step 5: Solve for x
    x = 934,377.44/993.42
  6. Step 6: Final answer
    x = 940.57

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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.