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Finding the Fourth Proportional to 999.86, 1,379.90 and 627.12

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Solution

The fourth proportional to 999.86, 1,379.90 and 627.12 is: 865.49

Step by Step Solution

  1. Step 1: Write the proportion equation
    999.86 : 1,379.90 = 627.12 : x
  2. Step 2: Convert to fraction form
    999.86/1,379.90 = 627.12/x
  3. Step 3: Cross multiply
    999.86x = 1,379.90 × 627.12
  4. Step 4: Simplify right side
    999.86x = 865,364.46
  5. Step 5: Solve for x
    x = 865,364.46/999.86
  6. Step 6: Final answer
    x = 865.49

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.