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Finding the Fourth Proportional to 999.22, 1,378.93 and 557.15

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Solution

The fourth proportional to 999.22, 1,378.93 and 557.15 is: 768.87

Step by Step Solution

  1. Step 1: Write the proportion equation
    999.22 : 1,378.93 = 557.15 : x
  2. Step 2: Convert to fraction form
    999.22/1,378.93 = 557.15/x
  3. Step 3: Cross multiply
    999.22x = 1,378.93 × 557.15
  4. Step 4: Simplify right side
    999.22x = 768,275.69
  5. Step 5: Solve for x
    x = 768,275.69/999.22
  6. Step 6: Final answer
    x = 768.87

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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.